Prince's After Show parties at the Indigo in the O2, after the main concert in 2007. Intimate club that held maybe 5-600 at most. I was three metres from the stage and totally in awe of his band leadership. Everyone never took their eye off him and he had a range of vocal and hand cues to drop various instruments out and bring them back in, or cue different sections of the song. They were totally on top of it and the effect was like listening to a remix in real time. There was also one moment two thirds of the way through a jam where the keyboardist wasn't getting a riff that Prince wanted him to play. Prince stops playing guitar, goes over to the keys, plays the riff, the keys player gets it. Then Prince puts his guitar down, goes over to the drums and carries on playing.
A tragic loss to music.