ok lesse. it's disc 2, i have tifa in my party, and when i went to nibelheim i punched (for the piano):

X square triangle L1+triangle L1+square X square triangle L1+X X square X

i can't seem to get final heaven. is that tune wrong, or is this something where it's a chance thing, and i have to keep trying? all i've found is tifa's secret savings.

THANKS!!!