> On 8 Feb 2018, at 01:59, Andrew Bernard <andrew.bern...@gmail.com> wrote: > > Good question, and lots of good answers. Modern practice is to follow the > order of the circle of fifths. But that was not always the case. So, indeed, > depends on your historical context. Bach was writing in G sharp for the WTC, > and it was most certainly not intended to be enharmonic with A flat. But if > you look at18C manuscripts and JS Bach in particular there is wide variance > in how key signatures were done, and Bach often repeated the notes in the > signature, say having two c sharps, for reasons of his own (quite interesting > to see). Obviously his music teacher would fail him today. This was before > the age of standardization of everything.
The key signature was a way to simplify notation, not to actually indicate the key of the musical piece-there examples where they do not agree. There is a similar problem with Balkan music: it may be useful to write a nonstandard key to simplify the ornaments in LilyPond which cannot handle them as intervals, but if the ornaments are very chromatic, an appropriate key signature will not help. > So I would discard advice about rewriting in A flat. G sharp is perfectly > good, even though the textbooks call it a 'theoretical key' - what they mean > is that it is hard to read when an alternative is available in an equal > tempered context. As Urs has said, there are plenty of valid musical contexts > for a key such as G sharp. Blatter suggests to do it for a harp, because otherwise the harpist will have to do it, which adds to the performance cost. > Since lilypond gives you the ability to change the ordering in the key > signature, you ahve complete freedom in what you do. > > Nothing new here, but I just wanted to chime in on this interesting topic. There is an additional complexity with microtonal accents, say like in Persian dastgah. It is indeed interesting what a good default might be. _______________________________________________ lilypond-user mailing list firstname.lastname@example.org https://lists.gnu.org/mailman/listinfo/lilypond-user