Yeah the music was the only good thing out of X2.
But the guy Nobuo Uematsu who wrote the music for FF left Square Enix after X was done. Surprisingly X2 had a good sound track.
12's music wasn't that great it was nice background music as you were playing but nothing you wanted to own or hear again and again.
FF 13 music sounds liks it's going to be similar to X2 have like a faster more jazzer kind of beat, with a mix of rock to it.
I mean listening to this Trailer I really hope this is the main Theme or battle theme.
YouTube - NEW Final Fantasy 13 trailer Extended PS3