How do I get Tifa's Final Limit Break?

Already have the button code but..

I Just finished launching the rocket into space on disk 2, and whenever I play the piano, i get cloud saying it was familiar and once I got 1 gil.

Also, to get vincent, i know you have to open the safe in nibelheim 2nd floor and beat the boss in there, get odin materia etc...

then head down to the basement there etc..

but the door where the coffins are supposed to be isn't open?

how do i do this?

Thanks to anyone who answered/will answer =)

How do I get Tifa's Final Limit Break?symatec

X=X S=square T=triangle C=circle : OK here we go. Play X,S,T,R1/L1+T,R1/L1+S,X,S,T,R1/L1+x,C,X,... when you finished the tune press start. Tiffa will say she has a sheet of music for that song. Inside the music you will find the limit break Final Heaven For Vincent unlock the safe on top floor of the shinra mansion, fight boss. when you win you find basenment key in safe. unlock the door and talk to him. tell hin about Sephiroth and hi'll go back to sleep. wake him again and get him to tell you his name. he goes back to sleep. when you leave he'll stop you abd join the party.

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