Count Basie and his band was on for a Caribbean cruise back in the 70's. They would play their set in the Double Room and after midnight most of them would head down to the Q4 and jam till the early hours. Sarah Vaughan was on with them (I think as a passenger) and she would also sing in the Q4 sometimes joining Basie's singer (her name escapes me) for a duet. You would get more than 10 musicians crammed on the tiny stage all impromptu. Great memories, I have photos buried away in my loft I will try to find them.