Soundslice MusicXML exporter 2026-09-27 Vocal 4 0 major 4 4 G 2 C 4 4 quarter D 4 4 quarter E -1 4 4 quarter flat F 4 4 quarter G -1 4 4 quarter flat A -1 4 4 quarter flat B -1 4 4 quarter flat C 5 4 quarter