Psychedelic Rock  ·  acid Rock

Iron Butterfly is an American psychedelic rock and early heavy metal band, well known for their 1968 hit "In-A-Gadda-Da-Vida". They are considered an early heavy metal band as a result of this song and others like it, as well as the title of their debut album, Heavy (which was actually an often used slang term for things of a thoughtful manner, or 'far out', and had little to do with the term heavy metal). Their heyday was the late 1960s, but the band has been reincarnated several times with various members. VH1 ranks them as number 19 on their list of top 100 "one-hit" wonders. In-A-Gadda-Da-Vida is the 31st best-selling album in the world, selling more than 25 million copies.   Wikipedia