Piano and Shabbat

I am not Shomer Shabbos (yet) but I would love to start. In my understanding music is part of the spirit.

But I have read that because playing on an expensive object (piano) might make it loose it’s value it’s forbidden to use.

And finally, the one that I am the most concerned with: I have an electrical piano, can I still use it? Should I put in on before the sunset?