Keyboard instruments belong to two basic groups, those that simply trigger or pluck a note like the harpsichord and organ, and those that are responsive to the strength of the musicians touch on the keys like the piano, clavinet and clavichord. Pianos have sustaining notes and the notes can be muted from the pedals. This with arrangement an experienced player creates feel, tension and mode, really what music is all about. Used in all types of music forms, from rock to classical.