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Fractions
Fractions as used by LilyPond are again stored as pairs, this
time of unsigned integers. While Scheme can represent rational numbers
as a native type, musically ‘2/4’ and ‘1/2’ are not the same,
and we need to be able to distinguish between them. Similarly there are
no negative ‘fractions’ in LilyPond’s mind. So 2/4 in LilyPond
means (2 . 4) in Scheme, and #2/4 in LilyPond means
1/2 in Scheme.