Hi, I found an article about music engraving* (in German): http://pian-e-forte.de/texte/pdf/notenschreiben01.pdf
It claims a rule for accidental placement and shows some examples of how chord accidentals are ordered on page 17 (second staff). This corresponds mostly to what LilyPond does, except the chord in the 5th bar (marked with "Here"). LilyPond follows the rule, that the lowest and highest accidentals are placed closest to the chord. But the arrangement of noteheads makes the author of the article change the order of the lower two accidentals, which is easier to read in my opinion, because the distance between the d sharp and its accidental is reduced (this is an exception from the rule, the author stated before). Even though the author is probably not an authority like the often cited Gould, I would be interested if that placement is correct (and perhaps even to be considered for LilyPonds algorithm). Cheers, Joram * On this website: http://pian-e-forte.de/texte/index.htm The article describes good practices of music engraving and I compared the rules mentioned there with the LilyPond output. Most of the rules are covered by LilyPond automatically. I could send a summary of the rules, a LilyPond user still has to care about, if anyone is interested.
<<attachment: accidentalsInChords.png>>
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