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.
As a boy I'd always had an interest in theater. But the idea at my school was that drama and music were to round out the man. It wasn't what one did for a living. I got over that.
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You can't really imagine music without technology.