This is the piano accompaniment to MW Balfe's Then You'll Remember Me from "The Bohemian Girl". You will hear 7 clicks before the start of measure 1 where the piano plays for the first 3 beats before the cello part comes in. In the middle when there is a fermata (or a long note/pause) you will hear 3 clicks to indicate the length. The cello part re-enters on the third click.
https://youtu.be/i_FCNJrmw1k