Clapton asked my brother to play on his record. I thought that was the most wonderful thing in the world.
Musicians are there in front of you, and the spectators sense their tension, which is not the case when you're listening to a record. Your attention is more relaxed. The emotional aspect is more important in live music.
If you're not pushing your own technique to its own limits with the risk that it might just crumble at any moment, then you're not really doing your job.

