Witness this 4 min. performance and Fanfare for the Common Man by Aaron Copeland (1941). Note the concentration of the players on the conductor. Note the timing of the timpani drums and lack of any regular rhythmic guidance as in a drumming beat of a country or rock band. How can they all play exactly on cue? I mean-- EXACTLY on cue. Nobody starts and stops a bit off cue although I suppose you could use a computer to determine if anyone was off a bit beyond human hearing. Are good orchestras using something more than a sense of timing-- perhaps a 6th extra sense? I've attempted to play on cue with others. It's very very tough. There are problems I don't even want to talk about in that regard. So this is a mystery to me.