SimplePiano is an aid for anyone learning to play piano and read music.
It uses Maestro fonts (that are installed with the program) to show the notes played on the treble and bass clef staffs.
The notes played are also highlighted on a 60-key on-screen piano keyboard.
You can play it using the keyboard, the mouse, or a MIDI keyboard (I recommend the M-Audio Keystation 61es).
The Circle of Fifths can be displayed, and when a key in it is selected, that key's signature is shown on the staffs.
Any of the eight most-used chords can be selected and played by playing the chord's root key. Chord inversions can also be selected.
A random note reading exercise is included.

The license of this software is Free Trial Software, you can free download and get a free trial.