http://www.youtube.com/watch?v=V7ErlkQIc4A

While it's not the best boss battle music I've heard in a video game, I really like this one. I find myself raising the volume on my TV when I get to a boss battle so I can hear it. Has me hoping the final boss music will be just as awesome.

It is

I think the Persona games have the best battle music ever. I can't decide which one is better though, them badass guitar riffs or 'OOH YEAH, BABY BABY, DA DA-DA DA DA DA DA-DA DA DA' as they both work perfectly.

I think its very good music. Look up "The Fog" I believe is what its called, its one of the main end bosses music, I think its one of the best.

I love all the music in P4.  I listen to the soundtrack CD's in my car on my way to and back from work.
It's awesome.

I have no shame!

The Persona OST in itself is a fine piece of work. I always found myself humming out the different themes while I was playing.

Hell, I even bought it, something which I rarely do.

The music in this game is just awesome.  Even my brother who doesn't like the game that much confesses to humming the different town "walking" themes.  "It's catchy", he says.

The song, "The Genesis" by itself may not give an impact, but within context is just freakin powerful.   Imagine the investigation team, half beaten and dead, having eaten a series of mind charges + medigoloan the previous battle...the song inspires dread and rightly so.

Fun fact: the piano solo that you hear after you beat the boss is the same song. So there 2 version, the guitar one and the piano version.