List of bands (15):

Haunt
Havok
Hazzerd
Heathen
Heaven Shall Burn
Heidevolk
Helloween
Heriot
Hideous Divinity
High On Fire
Hoax Of Upsala
Hollywood Undead
I Built The Sky
I Prevail
Iapetus
Ice Age
Illdisposed
Illusion
Imminence
Immolation