"The Rocking Grounds", it even has a cool name.
Just for you ShadowHeart, I'll post the names of the SO3 battle themes.
"The Cutting Edge of Notion" - normal battle theme. Never gets old, to me, although Sakuraba could cool it on the organ. (First flute/vocals, now organ-eccentric...oh well.)
"Malicious Fingers" - boss theme. Plays when you fight the random monster with no real reason to be there other than that it's the end of the dungeon and there must be some sort of boss. Gets kinda old, to me.
"Frightened Eyes" - boss theme. Plays when you fight alot of bosses on Elicoor, Shelby, Vox, among others. Also slightly repetitive.
"The Divine Spirit of Language" - Crossell's theme, Albel's theme. (The rockin' tune. Also plays if you fight Albel in the Urssa Cave Temple, I believe.)
"Influence of Truth Appearance" plays when you fight the Proclaimer in Moonbase, and the Executioner sequence.
"Powerbroker" plays when you fight the final Executioner, the Incapacitator. (Y'know, the cool dark angel thing with a funny voice. "Thou shalt not be forgiven!" xD) Also plays when you fight that demon boss in the final dungeon. It's the music with the chanting in the background.
"Bitter Dance"- plays when you fight Azazel, Berial, and Beelzebub, among others. (The hip-hoppish tune.)
"Do Evil" - plays when you fight Psuedo Blair and Gabriel Celeste in the Cave of Trials. (A nice tune.)
"Moody Goddess" plays when you fight Lucifer. (The jazzy tune, surprising for a final boss.)
"Highbrow" plays when you fight Lucifer's second form. (It's really long.) Iwadare's version plays when you fight Gabriel Celeste in Radiata Stories' bonus dungeon.
"Beyond the One" plays when you fight the Statue Lord in the Aquatic Gardens of Suferio.
"I am the No. 1!" plays when you fight the Sootie in the Cave of Trials (Hee hee, it's a funny tune.) It can also be considered Roger's theme. (Roger-witten!!)
"Confidence in the Domination" plays when you fight Lenneth Valkyrie in floor 210 of the Sphere Company Building. (She may kill you the first 20 times you fight her. I mean, jeez, I beat her when I ran out of healing items and it was just Albel alive, and he did a major attack out of desperation and then she died. xD Uh...anyway.) Also Valkyrie Profile's boss theme.
"Incarnation of the Devil" plays when you fight Iseria/Ethereal Queen at the top floor of the Sphere Company Building. (She's not as hard as Lenneth, but still a threat.) Also plays in Star Ocean 2 and Valkyrie Profile and Radiata Stories.
"Confidence in the Domination ~ Band Recording" plays when you fight one of the characters you didn't recruit in the Urssa Cave Temple. (It played for Roger, in one of my games.)
"You Know it Fails" plays when you fight another forgotten partner in the Urssa Cave Temple. (It played for Souffle for me, and I think Nel, but I'm not sure.)
"Highbrow ~ Band Recording" plays when you fight Fate in the Urssa Cave Temple. I don't believe it changes with Fate's partner, but I'm not sure. (I always get the alone ending. _L_; )
"The True Nature of All" plays when you fight Freya, the ultimate superboss. (20,000,000+ HP, yikes.) Also the A Ending's final boss music in Valkyrie Profile.
I think that's all...I think.