| Band | Genre |
|---|---|
| Gun | Rock |
| Guns'n Roses | Hard Rock |
| GWAR | Thrash Metal |
| Hail of Bullets | Black/Death Metal/Hardcore |
| Halestorm | Alternative Rock |
| Halford | Heavy metal |
| Hallows Eve | Thrash Metal |
| HammerFall | Power Metal |
| Hatebreed | Black/Death Metal/Hardcore |
| Heaven & Hell | Heavy metal |
| Helloween | Power Metal |
| Hellyeah | Thrash Metal |
| High on Fire | Heavy metal |
| Hole | Grunge Rock |
| Holy Moses | Thrash Metal |
| Hyde | Hard Rock |
| Ian Gillan | Hard Rock |
| Iced Earth | Power Metal |
| Ill Niño | Nu Metal |
| Immortal | Black/Death Metal/Hardcore |
