Tower of Power is a horn-based funk/soul band from Oakland, California. In the mid-1960s, 17-year-old tenor saxophonist Emilio Castillo moved from Detroit, Michigan, to Fremont, California. He started a band called the Motowns, specializing in soul music. In 1968, Castillo teamed up with baritone saxophonist Stephen "The Funky Doctor" Kupka and trumpet/trombone player Mic Gillette, moved to Oakland, and began writing original material. They changed the band's name to Tower of Power and began playing frequently in the Bay Area.

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