Collect the indicated amount of Rhythpo to unlock the corresponding song for the Chaos section of the Challenge series.

Battle 1 from Final Fantasy 4 (BMS): 30,000 PTS.
Dungeon of the Giants from Final Fantasy (FMS): 32,500 PTS.
Gurgu Volcano from Final Fantasy (FMS): 27,500 PTS.
J-E-N-O-V-A from Final Fantasy 7 (BMS): 40,000 PTS.
Mambo de Chocobo from Final Fantasy 5 (FMS): 37,500 PTS.
Something to Protect from Final Fantasy 9 (FMS): 45,000 PTS.
The Fierce Battle from Final Fantasy 6 (BMS): 35,000 PTS.
The Last Day from Final Fantasy 7 (FMS): 42,500 PTS.