instruction: What are the top 5 rock bands of all time?
output: The top 5 rock bands of all time is a difficult question as most individuals have different tastes and like various versions of rock.  There could be an argument that U2 belongs on that list given it's extensive catalog of music and presence on a global stage.  Others that might be considered include Led Zeppelin, The Grateful Dead, KISS, Radiohead.  This questions really comes down to what bands have grossed the most from Album sales & Touring receipts.  Any interesting question no doubt but comes down to their commercial success as well as the likes & dislikes of the fan.