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Yesterday's Children were an American psychedelic rock band formed in Cheshire-Prospect, Connecticut, outside of New Haven, in 1966. The group's earliest release was the psychedelic rock-influenced single "To Be or Not to Be". 

Though, at first, Yesterday's Children were a standard garage band, they transitioned into a progressive proto-heavy metal outfit that released one cult classic album in 1969 before disbanding.

https://en.wikipedia.org/wiki/Yesterday's_Children?...