(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?")
(music-property-description 'span-direction ly:dir? "Does this start or stop a spanner?")
+(music-property-description 'split-list list? "splitting moments for part combiner.")
(music-property-description 'start-moment-function procedure? "Function to compute the negative length of
starting grace notes.")