Harmonia is a music theory application that combines score notation and automatic tonal analysis and grading with text processing, image placement and audio, video and MIDI playback. The goal of Harmonia is to replace paper-based music theory documents — textbooks, workbooks, handouts, homework and tests — with digital versions that allow musical content to be created, edited, performed, searched, analyzed, annotated and automatically graded, all within an easy-to-use and elegantly styled user interface.