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2.3 Music functions

Music functions are Scheme procedures that can create music expressions automatically, and can be used to greatly simplify the input file.

2.3.1 Music function definitions
2.3.2 Music function usage
2.3.3 Simple substitution functions
2.3.4 Intermediate substitution functions
2.3.5 Mathematics in functions
2.3.6 Functions without arguments
2.3.7 Void music functions