HappyEO is a virtual instrument with your computer keyboard and mouse.

Always wanted to play the Piano or the Electric-Organ? Try HappyEO! It will turn your computer into a advanced Electric-Organ! A beginner can use it to learn musical theory and recognize score, and an expert can use the computer keyboard to play beautiful songs!
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HappyEO is a virtual instrument with your computer keyboard and mouse. It has many features only exists in advanced electric-organ. It's easy, funny and powerful. Create your own songs in minutes.
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Features<ul><li>
Play with your computer keyboard and mouse!<li>
Play with your two hands like piano!<li>
61 keys, 128 voices, 11 effects, include dual-voice and tremolo.<li>
Support reverb, chorus, and modulation (vibration).<li>
Support split keyboard.<li>
Support octave shift and transpose.<li>
Support Auto-Accompaniment, fill in, synch start.<li>
MIDI Recording and Playback<li>
Demo songs and full help included.