Ethan Allen Russellis an American photographer, author and video director, mostly of musicians. He is known as "the only rock photographer to have shot album covers for The Beatles, The Rolling Stones and The Who."... (wikipedia)
The fact of just being there was phenomenal.
He is beloved for his integrity as an artist. I think that matters.
What I think I do well, ... is capture real moments with extraordinary people.
Their idols were not pop stars but blues singers. Those idols were old already. So why would they not be old and perform?
If there is one you had to single out, it would be Lennon.