MusicXML allows for overlapping part groups, but many applications do not support that, requiring that they are properly nested instead. In this test, ‘Group 1’ (with a bracket) goes from staff 1 to 4, and ‘Group 2’ (also with a bracket) goes from staff 3 to 5. Group 1 Gr1 bracket yes Group 2 Grp2 bracket yes 1 0 major 4 4 G 2 4 1 light-heavy 1 0 major 4 4 G 2 4 1 light-heavy 1 0 major 4 4 G 2 4 1 light-heavy 1 0 major 4 4 G 2 4 1 light-heavy 1 0 major 4 4 G 2 4 1 light-heavy