What are many non metal genres and subgenres do you feel that are ones that would appeal greatly to metalheads?
There are lots I can really think of, like psychedelic rock, garage rock, prog rock, southern rock, stoner rock, post-rock, grindcore, neofolk, dark ambient, classical, jazz fusion, free jazz, grunge, drone, punk rock, anarcho punk, horror punk, crust punk, hardcore punk, D-beat, IDM, psytrance, metallic hardcore, martial industrial, power electronics, harsh noise, death industrial, EBM, power noise, industrial rock, gothic rock, deathrock, darkwave, neoclassical darkwave, underground/old school rap, psychobilly, outlaw/alternative country, noise rock, gabber, speedcore, breakcore, powerviolence, electro industrial, aggrotech, shoegaze, digital hardcore, thrashcore, terrorcore, dark/punk cabaret, japanoise, street punk, synthpop, trip hop, and goregrind.
There are lots I can really think of, like psychedelic rock, garage rock, prog rock, southern rock, stoner rock, post-rock, grindcore, neofolk, dark ambient, classical, jazz fusion, free jazz, grunge, drone, punk rock, anarcho punk, horror punk, crust punk, hardcore punk, D-beat, IDM, psytrance, metallic hardcore, martial industrial, power electronics, harsh noise, death industrial, EBM, power noise, industrial rock, gothic rock, deathrock, darkwave, neoclassical darkwave, underground/old school rap, psychobilly, outlaw/alternative country, noise rock, gabber, speedcore, breakcore, powerviolence, electro industrial, aggrotech, shoegaze, digital hardcore, thrashcore, terrorcore, dark/punk cabaret, japanoise, street punk, synthpop, trip hop, and goregrind.