Profiled here are the people who influenced, were influenced by, or were in some other way connected with one or more members of The Who. Readers should find a vast array of entries, ranging from musicians such as Billy Idol, who took part in live performances of "Tommy" and "Quadrophenia", and AC/DC guitarist Angus Young, who said Pete Townshend was the only guitarist ever to influence him, to behind-the-scenes people such as Glyn Johns, the English recording engineer and producer who helped create the acclaimed "Who's Next" (1971) and "Quadrophenia" (1973), and Nicky Hopkins, the much in demand pianist who was among The Who's earliest studio collaborators. Seemingly unrelated personalities such as Muppets creator Jim Henson are also included - he is believed to have modelled The Muppet Show's maniacal drummer Animal after The Who drummer Keith Moon.