"In-A-Gadda-Da-Vida" is a song recorded by Iron Butterfly and written by bandmember Doug Ingle, released on their 1968 album In-A-Gadda-Da-Vida.

According to the press page on Iron Butterfly's official web site, the song:

was supposed to have been named "In The Garden of Eden," but the singer was slurring his words when he told Ron Bushy, the drummer, the title, and the garbled name stuck. That's rock for you!

At slightly over 17 minutes, it occupies the entire second side of the In-A-Gadda-Da-Vida album. The lyrics are simple, and heard only at the beginning and the end. The track was recorded at Ultrasonic Studios in Hempstead, Long Island, New York.

The song is considered significant in rock history because, together with music by Blue Cheer, Jimi Hendrix, Steppenwolf, and High Tide, it marks the early transition from psychedelic music into heavy metal. In 2009, it was named the 24th-greatest hard rock song of all time by VH1. It is also often regarded as an influence on heavy metal music and being one of the firsts of the genre.

"In-A-Gadda-Da-Vida" was released as a 45 in the US and other territories. The 17-minute original version was edited down to 2:53. This version contains the intro, two complete verses, the repeat of the main theme very near the end, a short break, and the closing segment. Nothing at all is left of any of the solos.

In the Netherlands (and perhaps other territories, too), a different, longer 4-minute, 14-second edit was released first on a 45 with catalogue number 2019 021 and later on an EP with catalogue number 2091 213. This edit features only one verse, a large portion of the drum solo, the final verse, and the closing segment.

Another edit, supplied to some radio stations, runs at 5:04. It includes the first verse, about 20 seconds each of the organ and guitar solos, part of the drum solo segueing into the drum/bass solo, the final verse, and the closing of the song.

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Wikipedia