Re: Double-flats used by Lilypond after transpose

[Mark Knoop]

Toine Schreurs wrote:
> The transposition of the instrument does not depend on the key of the
>  music. On a B-flat sax a written C sounds as a B-flat. That's all
> the information you need.
> 
> So use \transpose bf c' {the music}
> 
> And indeed, key E-major goes to F-sharp-major. The original
> transposition from E-major to G-flat-major implies an A-sharp
> saxophone.

At the root of this is the possibility that there should/could be two
modes of transpose.

1) "Tonal" transpose: which would use double{flats,sharps} when
appropriate. e.g. (as in this case) a G in E major is a flattened third,
so when transposed to G-flat major *should* become a B-doubleflat.

2) "Atonal" transpose: which would favour the simplest spelling. e.g. G
transposed up a tone would *always* become A.

-- 
Mark Knoop