Organ Transplant: Making New Work for One of the Oldest Instruments

Sandra Soderlund
Sandra Soderlund

Far from being a historic curio, the pipe organ remains an active part of the current classical music scene. In the last several years alone, large pipe organs have been built in several major concert halls and university auditoriums in the United States, and many of these establishments have commissioned new works to inaugurate their instruments.

The organ can seem dauntingly complex to someone who is new to writing for the instrument. The pipe organ is a wind instrument playable by two or more manual keyboards and usually a pedal keyboard. Organ music is generally written on three staves—two for the hands as in piano music, and an extra bass staff for the feet.

The mechanism in a mechanical-action organ is relatively simple. When a key is pressed, it pulls down a long strip of wood called a tracker that opens a valve admitting wind to a pipe or pipes. (The wind was originally supplied by bellows that were pumped by hand.) The valve stays open and the sound remains constant until the key is released. Obviously the keyboards of a mechanical-action organ must be directly under or very near the pipes for the action to work smoothly. With the advent of electricity, blower motors replaced men to pump the bellows. Later electric playing action was introduced wherein the pressure of the key activates a circuit to an electro-magnet that opens the pipe valve. Today builders use both mechanical and electric action. Some new instruments have both, and the player can choose which to use. The main advantage of mechanical action is that the player has direct contact with the pipes and can control not only when they speak but also whether the attacks and releases are fast or slow. The disadvantage of mechanical-action instruments is that the player does not hear the sound the way listeners in the room do. The advantage of electric action is that the console can be placed anywhere, so the player can often hear the instrument in a balanced way. If, however, the console is too far from the pipes, the player experiences a significant delay in the sound that can be disturbing. The player does not have as much control over the touch in electric-action instruments as in those with mechanical action.

The electronic organ is not a real pipe organ, but the console often looks like one. Today the sound is usually produced by digitally-recorded samples from pipe organs. It is then amplified and put through speakers that are installed in the room. The stop knobs or tablets on an electronic instrument have the same types of name and number indications as those on a pipe organ. Some pipe organ builders use digitally-sampled sounds instead of the largest and most expensive pipes in their instruments to save space and money. The specifications of an instrument should tell which ranks are real and which are electronic.

A very important part of the sound of a pipe organ is the room in which it is built and its placement in that room. A reputable organ builder will design an instrument for a specific space and voice the pipes in that space once it is assembled. This is one of the reasons that every pipe organ is different. Part of the amazing sound of historic instruments is that they are often placed high in rectangular, reverberant rooms with thick, solid walls, no padding anywhere, and often under a barrel-shaped ceiling. Unfortunately most American rooms are wide and shallow with a great deal of padding that absorbs sound. A dry room allows for crisp staccato playing and very fast passage-work. Massive effects are disappointing, however. Final notes and chords often have to be lengthened and rests shortened to make up for the lack of reverberation. On the other hand a reverberant room may cause fast textures to be blurred. The reverberation can be used, however, to make lovely echo effects.

  • Bach Chorale played on the Silbermann organ at Freiberg Cathedral, Germany

Many tone colors are available on the pipe organ. Each of them is produced by a row or rank of pipes, one for each key on the keyboard that activates it. (Pedal ranks have fewer pipes than manual ones because there are fewer pedal keys.) The size and shape of the pipe and the material from which it is made (metal or wood) affect its sound, as with all wind instruments. Each rank of the organ is brought into play by a knob or tablet on the console called a stop. (The earliest organs had many ranks all sounding at once. Levers were added to stop the sound of some of them, resulting in the term “stop” as well as in the common expression “pulling out all the stops.”) Organists usually refer to the size of an organ by the number of ranks of pipes it has.

Each of the different keyboards of the organ, including the pedal, engages its own division of the instrument with several ranks of pipes. The stop knobs on the console indicate in which division the ranks are housed and therefore which keyboard activates them. The divisions are usually separate from each other (above one another, side-by-side, etc.). Often one division, usually called the Swell and played from the top manual, is housed in a box with shutters on it like vertical Venetian blinds that can be opened and closed by the player for subtle dynamic effects. The other divisions are called Great and Pedal on a two-manual organ. If there are three manuals the third is usually called Choir and located below the Great. The divisions may be coupled to each other so that the full organ can be played on one manual (the Great) and pedal.

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Organ sound is based upon the blending together of different pitches of the harmonic series. The sounding pitch of each rank is indicated on its stop knob by an Arabic number. Ranks that sound the written pitch are labeled 8′ (the length of an open pipe at low C), those sounding an octave higher are labeled 4′, two octaves higher 2′, etc. Ranks sounding an octave lower than the written pitch are 16′ and two octaves lower 32′. Other members of the harmonic series are also used, resulting in pipes sounding fifths or thirds above the fundamental pitch class.

When these ranks are drawn separately over the fundamental, one hears them individually, but when they are all played together the sound is a complex one that is louder and more colorful than that of a single rank. Often the highest harmonics are drawn together with one stop knob called a mixture. A Roman numeral on the knob indicates how many ranks are being engaged.

A typical American organ will have principals, flutes, strings, and a few ranks of pipes with brass reeds in them that imitate the woodwinds and brass of the orchestra. The basic organ sound is made by pipes called principals (or a similar name in French or German). Principals are generally available at many pitch levels, even on a rather small organ.

Flute sounds are available at several pitch levels on most organs.

  • Flute at 8′, with 4′, with 2′

Many organs have pipes that imitate string sound. To copy the sound of strings playing with vibrato, a separate rank of pipes is tuned sharp to beat with the main string sound. It is called a Celeste.

  • String played alone, with Celeste, with diminuendo made by closing the Swell shutters

Most pipe organs have ranks of reed pipes that imitate orchestral instruments such as oboes, clarinets, and even brasses. The Tremolo, which shakes the wind of the instrument, is sometimes added to reed solos.

The separate high harmonics, called mutations, can be mixed with fundamental pitches to make other piquant sounds as well. The colors available on a particular instrument, called its specifications, will tell the pitch level and placement of each rank. Before writing for any organ, consult its specifications to determine what colors are available. Every organ is different.

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The written range of organ music does not reflect the possible pitches available on the instrument, as explained above. Modern organ manuals usually have fifty-six notes (C–g”’) in Europe and sixty-one (C–c””) in the U.S. The pedal keyboard of an organ duplicates the first thirty or thirty-two notes of the manual keyboard (C–f’ or g’). Organ music should be written within this range. Some American builders use the European range, so check the specifications.

Usually an 8′ stop is present in any manual registration to provide the fundamental pitch unless a special effect is desired. A 16′ stop is usually present in the pedal for the same reason, along with an 8′ one to provide more definition. Writing for the pedal is like writing for cellos and basses playing together from the same part. Special effects are available on the pedal (like 4′ alone) but are rare.

Composers have differed widely in their concern for organ registration. The German baroque composers like Bach rarely indicated what stops to use. The French, on the other hand, have always been very particular about tone color and have usually given specific registrations for every piece. It is possible simply to use dynamic markings and descriptive phrases and let the organist register the music. Hindemith did this in his organ sonatas in spite of the fact that his orchestral music is very colorful. Even if specific stop names are used in the music, an organist will have to extrapolate because instruments are all different. Some indications are helpful, like “principals and mixtures” or “solo reed” or “soft flutes.” Obviously the organist would like to know what colors a composer has in mind. Registrations that are very detailed and require a much larger or quite different instrument than the one a player has available may keep a potential performer from playing a piece. Perhaps the best idea is to give general indications of color such as those suggested here.

The most important thing to remember when writing for the organ is that it is the only instrument whose sound is constant in dynamic while the key is pressed, unless the swell shutters are used. A constant sound seems to become louder, as composers of pedal points have always known. Also, most ranks of pipes are voiced to get subtly louder as they go higher in pitch so that the top voice in a full texture will sing through. Therefore if a melody is to be prominent in the tenor range, it has to be registered louder than the surrounding texture.

Organists play with both hands and the toes and heels of both feet. Because there is no way to sustain the sound when the finger or foot leaves the key, music that is to be legato has to be carefully fingered and pedaled. Organists are accustomed to using finger substitution, finger and toe slides, and other tricks to accomplish this. They also often manipulate the releases of notes to give the impression of accents in the music. Many subtle articulations are possible. Articulations should be indicated carefully in organ music as for all wind instruments. If there are no articulation markings, an organist will usually play legato. Pedal parts must be “choreographed” by the organist. The easiest pedal writing to play is for alternate toes, as Bach used in so many fugue subjects. One foot can play scalewise notes with alternating toe and heel, and it is possible to play a third with one foot, but not larger intervals. Slow pedal parts can usually be negotiated by the organist, no matter how awkward, but fast ones should be carefully planned if they are to be successful.

Many different textures are possible on the organ. The organ music of the past was usually polyphonic, often with three voices—one for each hand and one for the feet. This texture can be played on three different colors. A solo melody with some sort of accompanying figuration works well. The melody can be on top, in the middle, or in the bass as in hundreds of organ toccatas. As mentioned above, a fairly slow melody can appear in the pedal in the tenor or alto range, played on a 4′ stop, accompanied by both hands. Because of its sustaining quality, slow music is very effective, but fast music will work too, particularly in the upper registers. (The lower sounds tend to become muddy in a fairly large room.) In Herbert Bielawa’s Pulsar, the two manuals are balanced but different in color. One has a reed in the combination. The pedal also has reeds at 8′ and 16′ to help provide the strong accentuation. The entire texture is staccato with the exception of a few chords near the end.

  • Pulsar by Herbert Bielawa, performed by Sandra Soderlund, from Pipe Organ Adventures, Albany Records (Troy 374). Used by permission.

Ready to try writing your own work for the instrument? Meet with an organist who can demonstrate what is possible and study the scores of successful organ composers from all periods. In the end, however, sitting at the instrument and trying out ideas yourself is the best learning experience you can have, besides being a lot of fun.

Crash Course: Organ Culture 101

The organ has arguably undergone its greatest evolution and redefinition, for good or ill, in the past century. A few dozen North American shops manufacture approximately 115 new pipe organs each year. Sales numbers for digital instruments are harder to determine, let alone the number of “hybrid” instruments combining older pipe organ technology with either digital additions, or supplementing digital organs with some pipe ranks.

With the exception of occasional forays into entertainment, symphonic pipe organs in public halls, or the theatre organ which flourished somewhat majestically for a few decades before the advent of sound motion pictures, playing the organ has been an enterprise inexorably linked to religious institutions. The organ was introduced to Western Christianity by the Romans, and it has flourished there. With the exceptions noted above and those in the homes of a very few, wealthy individuals, pipe organs have almost exclusively been built for places of worship, and their repertoire has been associated with ritual or spirituality. Composers since the late Renaissance and early Baroque periods have also created a core of concert organ repertoire with especially important contributions coming from Bach, the German Romantic composers, and French composers of the late 19th to mid 20th centuries.

Who plays the organ?

In this complex universe, organists range from a handful of fulltime itinerant virtuosos whose livelihood derives almost exclusively from performance or recording, to a relatively large number of musicians who serve religious institutions in some regular, if not always fulltime capacity, to a difficult-to-tally number of part-time or amateur players serving churches on an occasional or volunteer basis, or playing the instrument for enjoyment. How can one estimate the numbers of such musicians? Many, though not all, join professional organizations such as the American Guild of Organists, the Royal College of Organists in England, the Royal Canadian College of Organists, or one of the denominational musical organizations like the Association of Anglican Musicians, the National Association of Pastoral Musicians, or the Presbyterian Association of Musicians. Many of these began as chartered, degree granting organizations. The American Guild of Organists and both Royal Colleges still grant certificates to associates or fellows, but, as the numbers of fulltime professionals have dwindled, and as universities and music schools have instituted advanced degrees in organ, these organizations have shifted their mission and emphasis to advocacy, continuing education, and “grass roots” cultivation of the profession. Membership gives some indication of the numbers of highly engaged persons in the profession, though hardly a complete count of organists.

The American Guild of Organists reports almost 19,000 members, though not all may actually perform on the instrument. Perhaps more to the point, there are over 325,000 houses of worship in the United States. While many are very small, rural, or urban store fronts that probably do not use the organ in worship (with pianos, electronic keyboards, or instrumental combos as the most frequent alternatives), even a conservative guess would suggest that there may be more than 100,000 or 150,000 musicians who play the organ in such settings.

What repertoire do these musicians play?

Organ repertoire also ranges widely. For the recitalists (a population of perhaps few thousand globally), the appetite for new, technically challenging, often abstract, music is constant. While difficult to term the concert market a “growth industry,” extrapolating from listed concert programs in the professional press suggests that there may be as many as 10,000 performances (outside of worship) per year the United States featuring the organ in a primary role.

But, given the number of houses of worship with organs, and the number of annual services in each, the number of liturgical organ performances extends into many millions yearly! That is a staggering number outflanking symphony performances, opera, chamber and solo music, and music theatre. As such, it is certain that, as a community writ large, organists are the most productive class of musicians in American society.

Repertoire varies according to occasional demands. For musicians in mainstream, liturgical churches, the weekly fare will be a mix of historically based “core” repertoire (like the Bach preludes and fugues, works of Franck, Mendelssohn sonatas, or Widor and Vierne symphonies) and works that are chant or hymn centered (choral preludes, liturgical suites, or freestanding movements based on Gregorian plainsong). In settings where worship is more “casual,” “contemporary,” or “blended,” meaning that musical elements derive from contemporary sources, non-Western culture, or “pop,” organists will favor newer works reflecting the particular style of the community song or ritual. Gospel music, for instance, is an example of a particular cultural idiom with its own techniques, types of instruments (classically a Hammond organ), and performance practice. Furthermore, under the “blended” rubric, “classical” composers have created significant and effective music using gospel, spirituals, or pop as source material almost all intended for classic organs.

As a general rule of thumb, the cultural style and ritual practice of the community for which the music is to be performed dictates the musical qualities of the repertoire, a comment both seemingly obvious and worth considering. To compose for the organ effectively requires not only an understanding of the techniques and idiosyncrasies of the instrument, but of the culture surrounding it. Complex and wide-ranging styles can be joined through common musical details, often harmonic or textural practice, that certify linkage to common beliefs and practices unifying the faith group. Thus, a composer creating new organ music intended, for instance, for Roman Catholic liturgical worship, may predicate such works on chant, hymn tunes, contemporary song, even Gospel (for all are legitimate and commonly used musical expressions in American Roman Catholicism), but must also somehow consider the “Catholic ethos” of such music.

Difficulty also matters. Organists and publishers alike hunger for “good music” devoid of excessive demands on playing technique. With a broad ranging organist population, many players may have limited technical proficiency. Such is the complex calculus: music of high aesthetic value, capturing the endemic spirit of the occasional setting, idiomatically composed, making reasonable technical demands on the performers many of whom may be amateurs. The composer achieving that goal will have a loyal client base among today’s organists.

Organists, perhaps more than other instrumentalists, have systematic and ample opportunity for professional development. The American Guild of Organists, like the denominational musical organizations, offers frequent continuing education opportunities at the national, regional, and local levels. Chapter meetings as well as annual regional and national conventions focus heavily on workshops, master classes, resource sharing, and sales of materials like scores and recordings.

In the concert playing métier, there is much thirst for attractive new repertoire to promote the instrument as well as engage audiences. Ubiquitous questions concerning repertoire persist. Where are the mainstream composers writing for the organ? Who will be the next Messiaen (implying what single name will emerge as the sine qua non of organ composing for the generation)? What works are current this season?

In general, the hunger and receptivity to new music is significant in the organ community as long as the music serves the purpose and exploits the capacities of the instrument without presenting undue technical challenges. The loyalty to and enthusiasm for new repertoire within those parameters is both constant and demonstrable.

A metric of this level of seriousness is demonstrated by a study in a related market. Some years ago, a recording label did a survey of its buyers and asked them to list their favorite composers and their willingness to buy works of those composers. Perhaps unremarkably, 80 percent of respondents rated Beethoven their top choice, of which number about 5 percent were willing to buy new issues of the composer’s works. But when it came to a predominantly organ composer—in this case Charles-Marie Widor—only 5 percent considered him a top choice, but 95 percent of that group were willing to buy the recordings. Such is the intense loyalty of this clientele.

—Haig Mardirosian

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Haig Mardirosian is dean of academic affairs and professor of music at American University, Washington, D.C. He is a concert organist whose monthly editorial column, Vox Humana, appears in The American Organist.

Further Resources

  • A Guide to the Pipe Organ for Composers and Others by Sandra Soderlund, Wayne Leupold Editions, Inc., 1994.

  • A Young Person’s Guide to the Pipe Organ by Sandra Soderlund with drawings by Catherine Fischer, American Guild of Organists, 1994. (Can be viewed online at www.agohq.org)

  • Pulling Out all the Stops: The Pipe Organ in America, video or DVD available from American Guild of Organists

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Sandra Soderlund is primarily an organist although she also performs on harpsichord and both modern and early piano. She is organist at the Unitarian Universalist Church of Berkeley and teaches harpsichord and organ at Mills College in Oakland, California. Soderlund holds degrees from Stanford University, the University of Southern California, and Bethany College, Lindsborg, Kansas. She is the editor of scholarly editions of keyboard works, including the Two-Part Inventions and Four Duets of J. S. Bach and the Livre d’Orgue of L.-N. Clérambault, as well as the author of articles on performance practices. Her book Organ Technique: An Historical Approach has been a standard text since its publication in 1980. The expansion of that book, entitled How Did They Play? How Did They Teach? A History of Keyboard Technique will appear this coming summer. She is on the editorial board of the Early Keyboard Journal. Soderlund has given recitals and workshops throughout the U.S., in Holland, Germany, and Korea, and most recently at Notre Dame in Paris. She has recorded for Arkay and Albany Records.

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