(change-to-type ,symbol? "Type of the context to change to.")
(class ,symbol? "The class name of an event class.")
(context ,ly:context? "The context to which an event is sent.")
(change-to-type ,symbol? "Type of the context to change to.")
(class ,symbol? "The class name of an event class.")
(context ,ly:context? "The context to which an event is sent.")