Use the style property of grob
Accidental to
select ancient accidentals. Supported styles are
mensural, vaticana, hufnagel and medicaea.
As shown, not all accidentals are supported by each style. When trying to access an unsupported accidental, LilyPond will switch to a different style, as demonstrated in input/test/ancient-accidentals.ly.
Similarly to local accidentals, the style of the key signature can be
controlled by the style property of the
KeySignature grob.
In this manual: Pitches, Chromatic alterations and Accidentals give a general introduction into the use of accidentals. Key signature gives a general introduction into the use of key signatures.
Program reference: KeySignature.
Examples: input/test/ancient-accidentals.ly.
This page is for LilyPond-2.4.5 (stable-branch).