Sadly burdened by the trivia of being the last studio recording to feature drummer Keith Moon and thus closing the chapter on the band's original lineup, this 1978 release was also a major progression, not unlike what The Beatles and The Beach Boys undertook as they matured from their simple, rudimentary but still great early years. The album peaked at No. 2 on the Pop chart in the U.S., most likely prevented from going No. 1 by the Grease soundtrack. The lone single released, the title song "Who Are You" would become a concert staple, often expanded into a jam for Townshend's guitaristics, and then be licensed out in 2000 for the opening theme to the hit television show CSI: Crime Scene Investigations.