A repeat with two alternative endings. In the first one (enclosing bar 2 to bar 4), there is a nested repeat enclosing bar 3. In the second one (from bar 5 to bar 6), there is another nested repeat starting also at bar 5 but ending already at the same bar. MusicXML Part 1 0 major 4 4 G 2 C 5 4 1 whole C 5 4 1 whole heavy-light C 5 4 1 whole light-heavy C 5 4 1 whole C 5 4 1 whole C 5 4 1 whole C 5 4 1 whole light-heavy