A piano staff with different keys and clefs for each of its staves. The key and clef for the second staff is given only after a <backup> element, just before the first note of the second staff, but after the whole measure for staff one has been output. MusicXML Part 96 0 4 4 2 G 2 F 4 384 1 whole 1 384 2 F 4 B 2 384 2 whole 2