Stange question, might not even be calling it the right thing, but like something in a song that is constant and ties the song together.
Metallica - No Remorse
Slayer - War Ensemble
Ozzy - Bark at the Moon
more but i cant quite think of them
Metallica - No Remorse
Slayer - War Ensemble
Ozzy - Bark at the Moon
more but i cant quite think of them