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Cream was a British power trio whose psychedelic style of heavy blues included heavy unison riffing and double bass drums, which would eventually become essential features of heavy metal and hard rock.
From Wikipedia: "Cream were a 1960s British rock supergroup consisting of bassist/vocalist Jack Bruce, guitarist/vocalist Eric Clapton, and drummer Ginger Baker. Their sound was characterised by a hybrid of blues rock, hard rock and psychedelic rock, combining the psychedelia-themed lyrics, Eric Clapton's blues guitar playing, Jack Bruce's voice and prominent bass playing and Ginger Baker's jazz-influenced drumming. The group's third album, Wheels of Fire, was the world's first platinum-selling double album."