Iron Butterfly

Iron Butterfly was an American rock band formed in 1966 and active in various lineups until disbanding in 2012. Their music fused psychedelic and acid rock with heavy, organ-driven arrangements and distorted guitar, often built around long, riff-based compositions and extended jams. The band is noted for a dense, reverb-heavy sound with prominent electric organ and a forceful rhythm section, and they are frequently mentioned in discussions of early influences on hard rock and heavy metal.