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Maj7/9 Chords

Major seventh ninth chords (Maj7/9) consist of a root, a major third, a perfect fifth, a major seventh, and a ninth note of the major scale built on the root.

Standard bass system allows you to play Maj7/9 chords on the accordion combining the major chord of the root with the major chord of its fifth degree.

Maj7/9 chords on Accordion in all keys: