This describes the ownership of certain classes in LilyPond. +
signifies a "list of". (This is not complete)

Score:
	Paperdef
	Staff+
	Score_commands
	Score_columns+
	PScore
		
Staff:
	Voice
	Staff_column+
	Command+


Voice:
	Voice_element

Voice_element:
	Request+


PScore:
	PStaff+
	PCol+
	Idealspacing+
	Item+
	Spanner+
	Spanner+ (broken)
	
