((none Instrument_name) . (extra-space 1.0))
((Instrument_name Left_edge_item) . (extra-space 1.0))
((Left_edge_item Clef_item) . (extra-space 1.0))
+ ((Left_edge_item Key_item) . (extra-space 0.0))
((none Left_edge_item) . (extra-space 0.0))
((Left_edge_item Staff_bar) . (extra-space 0.0))
; ((none Left_edge_item) . (extra-space -15.0))