Multiple choice general knowledge math & puzzles As the maestro lifted his baton the theater was so still you could hear _____. his heartbeat a pin drop bird wings the drum beating Reveal answer Fill a bubble to check yourself B Correct answer Explanation 'So still you could hear a pin drop' is a common idiom describing complete silence. The theater became quiet as the conductor was about to start the music. His heartbeat, bird wings, and drum beating would be sounds, not descriptions of silence.