Use custom font's flat (b) and sharp (#) symbols for chords

For typesetting chords, LilyPond uses its internal accidentals (i.e. it uses glyphs from the Feta font). This example shows how you can change LilyPond's behaviour to use the accidentals "#" and "b" from the currently selected font. This is useful if you'd like to use a font for setting jazz chords in RealBook style.