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Maj7 Chords

Major Seventh (Maj7) chords consist of a Root, a major 3rd, a perfect 5th, and a major 7th note of the major scale built on the root.

Standard Stradella bass system allows you to play Maj7 chords on the accordion combining the root with the minor chord of its 3rd degree.

Maj7 chords on Accordion in all keys: