From Aldo Vargas:
Pianito is a very intuitive and funny piano simulator great to learn music. Recommended for children and adults.
This piano features 128 different instruments and 48 percussion instruments, save unlimited songs recorded with instruments, replay with a single key pressing CTRL, all piano keyboard mapped to your PC (use SHIFT to play one octave down). Play perfect chords pressing a single key using the Auto-Chord feature.
Play in background your favorite MP3, midi or wave files as your rythm pattern while you play interactively with the keyboard of your PC.