On Wed, Mar 14, 2018 at 2:48 PM, Glassmenagerie <rdlang2...@gmail.com>
wrote:

> Here are a few measures of the 1st trumpet part in F of the 3rd dance of
> the
> Dvorak Slavonic Dances, Op46.  The Bb trumpet player would need to
> transpose
> up 7 intervals on the fly.  There is no key signature.  Quite a challenge
> for amateur players.  The concert key starts out in Ab, changes to C at mm.
> 66, then back to Ab at mm. 110.  I'd like the best way to arrive at the
> correct notes and key signature for the Bb trumpet.
>

The docs are always a good starting point:
http://lilypond.org/doc/v2.18/Documentation/notation/displaying-pitches#instrument-transpositions


Without looking at your example there are a few ways:

1) Write out the notes you want (Frescobaldi can transpose the notes in the
source).
2) Use /transpose to move the notes to what you want the players to read.
3) Use /transposition f in conjunction with some auto-transposition
libraries:
https://github.com/openlilylib/openlilylib/tree/master/editorial-tools/auto-transpose
.

I would suggest not using a key signature in either the original or the
transposed version for a trumpet part, but if you really want that you
could use tags (or the fancy edition engraver that's all the rage these
days: https://github.com/openlilylib/edition-engraver).

-----Jay
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