"The function to run with \\applycontext. It must take a single argument, being the context.")
(music-property-description 'property-operations list?
"Do these operations for instantiating the context.")
-(music-property-description 'predicate procedure? "the predicate of a \outputproperty")
+(music-property-description 'predicate procedure? "the predicate of a \\outputproperty")
(music-property-description 'type symbol? "The type of this music object. Determines iteration in some cases.")
(music-property-description 'types list? "The types of this music object. Determines iteration in some cases.")
(music-property-description 'repeat-count integer? "do a @code{\repeat} how ofen?")