Piano with two notes before first performance (8)
I believe the answer is:
premiere
'first performance' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for premiere that I've seen before include "First showing of play or film" , "First screening" , "First show" , "Leading actress" , "significant performance" .)