Douglas Lloyd Ingle (September 9, 1945 – May 24, 2024)[1] was an American musician, best known as the founder, organist, primary composer and lead vocalist for the band Iron Butterfly.

[citation needed] Ingle founded Iron Butterfly in San Diego in 1966, remaining with the group when they relocated to Los Angeles later that year, and became part of the group's classic lineup, featuring Ingle, drummer Ron Bushy, guitarist Erik Brann and bassist Lee Dorman.

[citation needed] According to drummer Ron Bushy, organist-vocalist Doug Ingle wrote the song one evening while drinking a gallon of Red Mountain wine.

[4][5] Their music has found a significant impact on the international rock scenes, influencing numerous acts such as Black Sabbath, AC/DC, Rush, Alice Cooper, Mountain, Uriah Heep, Soundgarden, Stone Temple Pilots, Slayer, King Gizzard & the Lizard Wizard, and Queens of the Stone Age.

[citation needed] Ingle had a short stint with the pop group Stark Naked and the Car Thieves in the early 1970s after he left Iron Butterfly.