SimplePiano is an aid to learning piano and music notation. It uses Maestro fonts (that are installed with the program) to show the notes played on the treble and bass clef staffs as well as on a 60-key on-screen piano keyboard, using either the keyboard, the mouse, or a midi keyboard connected to the computer. The Circle of Fifths can be displayed, and when a key in it is selected, that key's signature is shown on the staffs. Eight types of chords can be selected and played by playing their root key. The output piano sound (Windows or soundcard sound) is selectable. I recommend the M-Audio Keystation 61es midi keyboard to go with it.