Guys...You get Tifa's Final Limit break in the piano by playing a Tune that I don't know off the top of my head so go find it somewhere else. You get her Ultimate Weapon by Going to Midgar in disc 3 and going to Wall market and using the shop that tried to kill u in first disc. U need a key to get to it and if u go to Midgar u can find where to get the key by talking to the guy there.