Click MusicalKEYS 3.0.214 for Windows

Having over 100 instruments at your disposal has never been as easy as with Click MusicalKEYS. The program uses the classic American code based on the first 7 letters of the alphabet (C-Do, D-Re, E-Mi, F-Fa, G-Sol, A-La, B-Mi) and the three tone division. You can thus play the piano by using either your keyboard or your mouse, creating your own melody or playing your favorite song.

The program lets you choose between 127 different instruments (violin, synthesizers, guitars...). Plus, it lets you save what you play in .mus format which can then be recorded in MIDI using a compatible program.