Why are the musicians onstage playing before the concert begins?
Just like basketball players taking shots and practicing moves before the game, musicians need to warm up their muscles and focus their concentration. This is fun to listen to and to watch. Some of them are working on the passages they need to polish up before the performance, with no regard for what anyone else is practicing. Pick out the flute or the trumpet playing a solo line over and over, and listen to how it changes. Does it get smoother? If the player stops in the middle and starts over, can you hear the reason why? (It’s especially fun to recognize these solos later in the performance! Give a silent cheer for the player who nails the solo.) Not all of the orchestra players practice onstage, of course. Just like the audience, everyone is doing his or her own thing. Some are talking; others are paging through their music. And some don’t come onstage at all until a minute or two before the performance. But at concert time, everyone is in place and ready to start.
