Of all musicians, alive or dead, you get to choose as many as you want for one big hour long jam in your parents’ garage. You have to play with every musician for the entire hour, so no 15 minutes with The Who and 30 minutes with the Berlin Philharmonic and 15 minutes with Mozart.
Oh, and what is your instrument?
I play guitar, and I would spend that hour with Ginger Baker and Jack Bruce.
2nd choice would be with Miles’ band from the early 80s, but I would feel woefully inadequate.