Iggy Pop
Iggy Pop is the reason your parents don't want you to listen to punk music. He popularized danger in a public music format, and he also industrialized straight edge culture and brought forth punk rock's first street gangs. Iggy Pop pushed the boundaries of what a live performance meant to a casual audience. He even offered a $1 million dollar incentive to a promoter at Madison Square Garden for him to commit suicide on stage. This was a joke, but that was the length that Iggy Pop was willing to go for showmanship.
Jimi Hendrix
What Hendrix lacked in stage energy, he backed with pure musicianship and explosive skill. This young mastermind drove the realm of emotional guitar playing to the place it's in today. If it weren't for Jimi Hendrix, nobody would use the term "making the guitar sing."