instruments

I have a piano and it lets go of music once you play it. I think its like each key represents an instrument a different note , sound ,beat or rythem. A rythem would be when you , lets say choose three notes and put thm in a pattern or specific way.  A  sound  would  be none as in other words a noise , something you can hear. Last a beat would be like a rythem or a noise you craete with your hands, feet, or an object ect.