Help Transposers

Horns and trumpets in D means they are instruments 'tuned' one tone higher than instruments in C (e.g., piano, violins, flutes, etc.). Now, having to use a standard notation system, the same for every instrument, when writing parts for instruments in D, one must remember that a C played by a trumpet in D corresponds to a D on a C instrument. Since in an orchestra C instruments are (usually) in the numerical majority compared to [transposing] instruments, and considering that transposing instruments do not always have the same transposition, the parts of the latter are written in relation to the C instruments. To simplify: a trumpet in D produces sounds ONE TONE HIGHER compared to C instruments; therefore, in a piece in the key of C major, the trumpets in D will have their parts written in Bb major. Conversely, transposing instruments

in Bb produce sounds ONE TONE LOWER compared to C instruments; therefore, in the aforementioned hypothetical piece in C major, the parts for a Bb clarinet will be written in D major.

N.B. In many scores (which are implied to be intended for the study and use of composers/conductors), for practical reading reasons, all parts are written in ACTUAL NOTES (i.e., the sounds actually produced), while the relative individual parts will be written based on the transposition of the specific instrument. This happens quite often but not always. Therefore, one must understand the nature of the score by observing the key signatures of the transposing instruments: if they are the same as those of the C instruments, it means the score is written in ACTUAL NOTES; otherwise, each section of transposing instruments will have its own specific key signature (accidental markings in the clef).

Thanks ScalaQuaranta, but from your examples I've developed a doubt regarding the horn in F. If it is true that the horn in D sounds a tone higher (so the player reads C and plays D), then the horn in F should sound a fourth higher. I thought it sounded a fifth lower...

... tell me, I'm making a mess

Hi brown, I'm replying quickly but I'll tell you in advance that at this moment I am not 100% sure, but as soon as I have time I will check. In any case, if I remember correctly, the C written for an F horn corresponds, as a REAL SOUND, to the F a perfect fifth descending from C.

Yes, it is right

ScalaQuaranta wrote:

Hi brown, I'll reply quickly but I'll tell you in advance that at this moment I am not 100% sure, but as soon as I have time I will check. In any case, if I remember correctly, the C written for a horn in F corresponds, as a REAL SOUND, to the F a descending perfect fifth away from the C.

So how does the criterion you described above fit in? Trumpet in D one tone above....horn in F, a fourth above. No, a fifth below ... mmhm

It simply doesn't fit. Those described are the characteristics of every transposing instrument considered, probably due to the constructional nature of each individual instrument. I believe it depends mainly on the range of each single instrument and on the intention to "layout" the respective parts within the range of a single staff. Thus, to achieve this, one resorts to the clefs of the SEVEN-KEY instrument (e.g., viola, bassoon, etc.) and the TRANSPOSITIONS we have seen so far. These are concepts to be accepted as they are, without asking too many "whys," unless you want to undertake specific organological studies. Someone else might complete my answer with other elements, perhaps of a historical, acoustic, etc., nature. Anyway, I believe that from a compositional point of view, the "whys" and "hows" have no reason to exist. However, I must say that you have raised an interesting topic because many times I have also asked myself, "for what damn reason are musical instruments not all in C?" .

There is no mathematical rule to determine transpositions, because it is a set of various practices that have layered over the centuries.

A small piece of advice: buy an orchestration manual. At least you can clear up all your doubts.

I have Samuel Adler, The Study of Orchestration, but I think the others are just as good.

Even if a bit late, thanks guys. In fact, as RedScharlach says, it seems impossible to always find a valid criterion ... which was what I initially understood from ScalaQuaranta's writing. Practically every case is a story in itself.