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• Iron Butterfly is an American psychedelic rock and early heavy metal band, well known for their 1968 hit "In-A-Gadda-Da-Vida".
• are considered an early heavy metal band.
• Iron Butterfly is now working on a new album that should be released in 2008.

In-A-Gadda-Da-Vida is the 31st best-selling album in the world, selling more than 25 million copies