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How was Joe Perry's Aerosmith formed?
During Perry's early years he formed a band with Tom Hamilton called The Jam Band. Steven Tyler, Brad Whitford and Joey Kramer eventually joined them and the band became Aerosmith.
Where did the name Aerosmith come from?
The name Aerosmith had popped into drummer Kramer's head after listening to Harry Nilsson's album Aerial Ballet, which featured jacket art of a circus performer jumping out of a biplane.

Question: When was the group formed?
Self-contained rewrite: When was Joe Perry's Aerosmith formed?