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 will 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 in--he is believed to have modeled the Muppet Show's maniacal drummer Animal after the Who drummer Keith Moon.