+(music-property-description 'start-moment-function procedure? "Function to compute the negative length of
+starting grace notes.")
+
+(music-property-description 'symbol symbol? "Grob name to perform an override/revert on.")
+(music-property-description 'text markup? "markup expression to be printed")
+;; markup?
+(music-property-description 'tremolo-type integer? "")
+(music-property-description 'value scheme? "Assignment value for a
+translation property")