On 9/21/10 9:28 AM, "Joseph Wakeling" <[email protected]> wrote:
> On 09/21/2010 04:52 PM, Carl Sorensen wrote: >> However, I was wrong in my assumption that something about the key signature >> should determine which of the enharmonic equivalents should be used. >> Instead, it appears that the neighboring notes should govern in tonal music. >> In atonal music, it doesn't matter, except that it does in rapid passages. >> There's virtually no guidance there that I can see for nontonal music. > > Stone's guidance about the choice of accidentals is IMO something for > composers to consider rather than Lilypond. From a Lilypond point of > view, the issue should simply be: the composer can have the accidentals > s/he chooses. This is true as long as the accidentals don't change with transposition. If the composer would choose different accidentals in a transposed piece, then it becomes part of LilyPond's problem. > >> Transposition of exact quarter tones into appropriate notation is likely to >> remain a *very* tricky problem. > > Why do you think so? If you're transposing in a regular fashion (i.e. > by a certain number of semitones) you just transpose the underlying > notes and preserve the arrows. If you want to transpose up/down by a > quarter-tone, you just add an up/down-arrow to all the accidentals that > don't already have one; all those that do, you bump them up/down to the > next 'tonal' accidental. This is true, as long as you are only transposing by a quarter tone. What if you are transposing by a semitone plus a quarter tone? And what about the finer gradations of tone, e/g 1/8 tone, etc. You're clearly much more of an expert in this than I, so I may be wrong. But it seems like handling quarter-tone accidentals is only easy if the highest resolution on the transposition is a semitone. And that may be the case for practical music notation. But it's not infinitely extendable, I think. > > The only thing you have to take into account is that you almost > certainly need to convert double-sharps and flats to naturals of the > staff pitches above and below respectively. That requirement is one > reason I've been trying to address Lilypond support for chromatic > transposition recently. Yes, I can see how this would work. Thanks, Carl _______________________________________________ lilypond-devel mailing list [email protected] http://lists.gnu.org/mailman/listinfo/lilypond-devel
