Nashville Number System

The Nashville Number System is an informal method of transcribing music by denoting the scale degree on which a chord is built. It was developed by Neal Matthews, Jr. in the late '50s as a simplified system for The Jordanaires to use in the studio and further developed by Charlie McCoy. It resembles the Roman numeral and figured bass systems traditionally used to transcribe a chord progression. By writing chords as numbers, music may be transposed easily. As a simple system of transcription, it can be used with only a rudimentary background in music theory. Improvisation structures can be quickly explained using numbers and chord changes can be communicated mid-song by holding up the corresponding number of fingers. The system is flexible, and can be embellished to include more information (such as chord color or to denote a bass note in an inverted chord).

For example, each chord in the key of C is labeled 1, 2, 3, etc. such that C=1, D=2, E=3, etc. Thus, the chord progression C///F///G///C/// would correspond to 1///4///5///1/// in Nashville notation, while G///C///D///G/// in the key of G would also become 1///4///5///1///.