The original version.
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Link to video
""California Dreamin'" is a song written by John Phillips and Michelle Phillips and first recorded by Barry McGuire. The best-known version is by the Mamas and the Papas, who sang backup on the original version and released it as a single in 1965. The lyrics express the narrator's longing for the warmth of Los Angeles during a cold winter in New York City. It is recorded in the key of C-sharp minor."