Gaum-Hermer (Boss Theme)
Gaum-Hermer (Boss Theme) plays during each boss battle.
The title comes from the album Galaxy Force. This song is the first section of part 3 of track 2. It's also track 4 on Sega System 16: Complete Soundtrack Vol.2 where it is titled "Gaum-Hammer (Boss Theme)". Which version is correct remains unknown.
Altered Beast (ARC)
This is the original composition of Gaum-Hermer as composed by Tohru Nakabayashi.
The song plays on a YM2151 and is internal song number 0x90.
Altered Beast (GEN)
The Genesis version plays on the YM2612.
Altered Beast (SMS)
The Master System and Mark III releases of Altered Beast use Gaum-Hermer, not as the boss theme, but as the background music for after they player transforms into a dragon or weretiger. Werewolf transformations still play Altered Beast (Power Up).