- if the 3rd IS NOT mentioned, it is a MAYOR 3rd (except when written otherwise)

- if the 5th IS NOT mentioned, it is a PURE 5th (except when written otherwise)

- if the 7th IS mentioned, it is a MINOR 7th (except when written otherwise)

- if the 7th IS NOT mentioned, the chord COULD CONTAIN a MINOR 7th(so it is skipped, and the chord has some 9th, or 11th, or 13th)

- if the 9th IS mentioned, it is a MAJOR 9th (except when written otherwise)

- if the 9th IS NO- if the 9th IS NOT mentioned, the chord COULD CONTAIN a MAJOR 9th(so it is skipped, and the chord has some 11th, or 13th)

- if the 11th IS mentioned, it is a PURE 11th (except when written otherwise)

- if the 11th IS NOT mentioned, the chord COULD CONTAIN the PURE 11th(so it is skipped, and the chord has some 13th)

- if the 13th IS mentioned, it is a MAJOR 13th (except when written otherwise)

Unwritten Rules(not so unwritten any more... :)

JAZZ CHORDS NOTATION