Evansville Philharmonic Orchestra

Look closely and you'll see that some of them do! But in general, they are concentrating deeply, just like outfielders waiting for the fly ball or pitchers winding up to a curve ball. They're in the zone.

After the music is over, you may see them smiling broadly. If it was a concerto, and they liked the soloist's playing, they won't just smile—the string players will tap their stands with their bows as a sign of appreciation.