Classical music rules that no-one else would dare tell you How do you impress your classical-savvy friends? Worried about saying the wrong thing at a concert? We've got all the tips you could possibly need. 1. Coughing 2. Clapping 3. Shh 4. Brass players 5. Singers 6. Drink 7. Phones 8. Viola players 9. Conductors 10. Pub