What 1960s folk-pop quartet is famous for their intricate four-part vocal harmonies on the hits "Monday, Monday" and "California Dreamin'"?
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The Mamas & the Papas
The Mamas & the Papas were a defining group of the California "sunshine pop" sound during the mid-1960s. They were also central figures in the counterculture movement and helped organize the Monterey Pop Festival.