HappyEO Express   
by HappyEO   

Always wanted to play the Piano or the Electric-Organ? Try HappyEO Express! 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!
HappyEO Express 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.
Features
Play with your computer keyboard and mouse!
Play with your two hands like piano!
61 keys, 12 voices.
Support reverb, chorus, and modulation (vibration).
Support split keyboard.
MIDI Playback
Demo songs and full help included.