Chord symbols (for example, Cmaj7 or G6) are a type of notation used frequently in jazz and other areas of modern music to notate chord progressions and changes. This type of notation differs from that of classical music in that chord symbols don’t show the function of a chord the way the Roman numeral notation does. Chord symbols, for modern music with lots of changes, are much easier to read. They function as a sort of shorthand for change-heavy music and are written with four chord parts in mind: the root, the quality, the extension, and the alterations.
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