The order I put them all have no significance, I actually like a lot of them, but here are my five:
1.The 13th Struggle
2.Scherzo Di Notte
3. Sinister Sundown
4 The 13 dilema
5.One-Wing angel
(passion or sanctuary arent battle musics)
the funniests that I have heard (and liked) were Rowdy Rumble, and Byte Bashing.
I also have to say that the Another side another story music in FM, is used in Kh2 so much, and in so many ways. Like in the 13 dilema, Fantisia alla Marcia, Organization 13, A fight to the death. Its all from another side another story, only altered, or changed a bit XD