With Featuring Motörhead, Testament, and AC/DC. Metal combines overdriven guitars with heavy drums, often double bass drums, bass lines working with and against guitar lines and vocals from voices at the limit of their power. In blues, the raw voice might sing over the gentle acoustic guitar or the mellow church organ. In hard rock, the overdriven guitar might howl against the slower groove of bass and drums. In metal, everything is at "10."