Much contemporary sheet music makes use of chord symbols and chord diagrams. These notations of musical harmony are found in such different types of sheet music as lead sheets, piano / vocal / guitar arrangements, worship music, and jazz big-band charts.
MusicXML’s harmony element provides a rich description of both harmonic content and the appearance of chord symbols and diagrams. It can be used both for functional harmony analysis as well as chord symbols. Chord symbols and diagrams are the most common use, and that is what we focus on here.