Looks to me like artists singing songs about fictional (alter ego?) musicians...
Elvis Presley : Jailhouse Rock
Tom Petty : Into The Great Wide Open
Billy Joel : The Entertainer
Grateful Dead : Uncle John's Band
Creedence Clearwater Revival : Down On The Corner
David Bowie : Ziggy Stardust
Elton John : Bennie And The Jets
Chuck Berry : Johnny B. Goode
Beatles : Sgt Pepper/w Help From My Friends
Dire Straits : Sultans Of Swing
