Douglas Lloyd Ingle (September 9, 1945 – May 24, 2024) was an American musician, best known as the founder, organist, primary composer and lead vocalist for the band Iron Butterfly. He wrote the band's hit song "In-A-Gadda-Da-Vida", which was first released in 1968, and was the last surviving member of the band’s 1967–1969 lineup.

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