Considering I'm a huge JJ2 nerd, I can safely say that there are only two boss tracks in the game. I've yet to download this rip (I already have all of the music and even some wip versions, so really why bother) so I can't say for sure if it has both of them or not.
Also, the music in this game for the Hell stage = win.
EDIT- While I ponder why the tracks are listed the way they are and why there is a subtitle (which isn't as clever as it wants to be imo), it is mostly complete save for the second boss tune which I have uploaded here (
http://www.mediafire.com/?8nbupgzwosi) and a track labeled "jaz30" (i think, may have it wrong) which is an insanely short jingle never used in the game and seems like a barely started song.