From The App Developers: Imagine yourself playing a violin with an orchestra. String Trio is "Air-Violin" application with graphical guides. It plays like a real violin. Just tilt, swing and slide your iPhone/IPod as guide bars fall. Control tempo, speed, and strength of your movement, then all the accompanying music will automatically adjust to your lead. As its name implies, String Trio consists of three string instruments; violin, viola, and cello. You can play music with instrument of your choice. It's easy, enjoyable, and educational that anyone will instantly feel like playing a real violin without learning how.