+bracketOpenSymbol = #(make-span-event 'BeamEvent START)
+bracketCloseSymbol = #(make-span-event 'BeamEvent STOP)
+tildeSymbol = #(make-music 'TieEvent)
+parenthesisOpenSymbol = #(make-span-event 'SlurEvent START)
+parenthesisCloseSymbol = #(make-span-event 'SlurEvent STOP)
+escapedExclamationSymbol = #(make-span-event 'CrescendoEvent STOP)
+escapedParenthesisOpenSymbol = #(make-span-event 'PhrasingSlurEvent START)
+escapedParenthesisCloseSymbol = #(make-span-event 'PhrasingSlurEvent STOP)
+escapedBiggerSymbol = #(make-span-event 'DecrescendoEvent START)
+escapedSmallerSymbol = #(make-span-event 'CrescendoEvent START)
+