It's not inaccurate to call Iron Butterfly a one hit wonder but it is unfair. In seventeen minutes and four seconds "In-A-Gadda-Da-Vida" ebbs and flows and constricts and expands exploring every corner of psychedelia, prog, garage, acid, occult and hard rock.  The songs lyrics, vocal melody, sludgy guitars, bass fills and two minute plus drum solo would influence scores of bands across every genre of heavy music and is in an off itself still a thrilli listen some 56 years since its release.