On 8/9/2015 10:38 PM, Werner LEMBERG [via Lilypond] wrote:
The same as with the double-flat: we need evidence from real-world
scores to decide this.
Do you have time to check this?
A quick scan through IMSLP:
1. (Breikopf & Hartel, 1880) Chopin, Polonaise in B-flat minor:
Identical flats
2. (Peters, 1895) Grieg, Piano Concerto in A-minor (for piano 4 hands):
Identical flats
3. (Universal, 1920) Bartok, Studies for Piano, Op. 18: Identical flats
This is in way definitive, but seems like nice evidence for using
identical flats. I'd be very interested in seeing a score where they
were intentionally /not/ identical.
- Abraham