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Start or stop a staff symbol.
Event classes: staff-span-event, span-event, music-event and StreamEvent.
Accepted by: Staff_symbol_engraver.
Properties:
name(symbol):'StaffSpanEventName of this music object.
types(list):'(general-music event span-event staff-span-event)The types of this music object; determines by what engraver this music expression is processed.