I'm describing a scene in which the father picks up the kid and puts her on the piano. While doing it, a random sound comes out of the piano because some keys were randomly pressed by the kid's body. Now I want to describe the sound and the context to the reader, and put it in the text you know like a script of a play where they put contextual cues within brackets.
[The piano ........]
.... keys were randomly pressed? I don't think so. It's awkward.