AKA: Gb6, Gb6th, Gb add6, GbM6, Gb Maj6, Gb Major sixth, Gb major6, Gb sixth
Major 6th chord
A major 6th chord is a four-note chord that contains the Root, the 3rd, the 5th, and the 6th of the major scale. In terms of intervals, a major sixth chord contains a major 3rd, perfect 5th, and major 6th. In other words, it’s a major triad with an added 6th.
The formula for major chords is R, 3°, 5°, 6°. For example, in C6 we have the notes C, E, G, A.
On a standard bass accordion, you can play major 6th chords by combining the Root with the minor chord of its 6th interval. For example, if C is the Root, adding an A minor you get a C6(5th omitted). You should add the major chord of the Root to get a full 6th chord but the 5th doesn’t add any tension so it can be omitted.
Major 6th chords are very common in pop, rock, and jazz music.
G♭, B♭, D♭, E♭
R, 3°, 5°, 6°
G♭+ E♭m (F# + D#m)
4 + 2 or 5 + 2