What physics concepts apply to pianos besides mechanics?

[SMB20]

Homework Statement

This is more of a general question:
In what ways (besides mechanical), can physics be applied to Pianos? I'm already onto strings and energy, but are there any other ways?

Homework Equations

The Attempt at a Solution

 

[LogicalTime]

There are lots of mathematical relations in music that you would play on a piano. What things sound discordant etc. Other than that though, what is the piano but a set of vibrating strings producing sound waves?

I suppose we could slide a piano down an inclined plane if you like... maybe get a nice Doppler shift if it's going fast enough...