noBreak = #(make-event-chord (list (make-penalty-music 10001 0)))
pageBreak = #(make-event-chord (list (make-penalty-music -10001 -10001)))
noPageBreak = #(make-event-chord (list (make-penalty-music 0 10001)))
+stopStaff = #(make-event-chord (list (make-span-event 'StaffSpanEvent STOP)))
+startStaff = #(make-event-chord (list (make-span-event 'StaffSpanEvent START)))
%