Harmonica - Level 3 - Digital Download SKU: A0.886870 Composed by Wolfgang Amadeus Mozart. Arranged by Justin M. Ryan. Classical,Contemporary. Score. 4 pages. Justin M. Ryan #3004821. Published by Justin M. Ryan (A0.886870). Written in 1791 by W.A. Mozart, this work was composed for Glass Harmonica(an instrument developed by Benjamin Franklin). Now in the 21st Century, it has been arranged for 2 Glass Harmonicas in 2 different keys simultaneously . This 28 measure piece is now in the keys of C major and G major(Perfect 4th apart). Short but hauntingly beautiful, the song now explores beautiful harmonies and new possibilities.