Legendary "musician photographer" Jim Marshall has died. Took some of the most iconic music photographs in history - Cash flipping the bird at San Quentin, Hendrix lighting his guitar, Dylan, The Who. He had access that music photographers now can only dream about with today's 30-in-the-pit, just-for-three-songs, give-up-your-rights music shooting world.
Maybe it was an early morning rehearsal before the concert?
It could be but judging by the clutter on the floor, I am thinking after. I prefer to think after. After further inspection, it appears Monk is talking to the janitor. I did a really crappy scan of the picture: