Ace of Cups is an American rock band formed in San Francisco in 1967 during the Summer of Love era. It has been described as one of the first all-female rock bands.
The members of Ace of Cups were Mary Gannon (bass), Marla Hunt (organ, piano), Denise Kaufman (guitar, harmonica), Mary Ellen Simpson (lead guitar), and Diane Vitalich (drums). Lead vocals were sung by all members of the band except Vitalich, and all five sang backup. The songwriting, too, was divided among the band members.