To play the Gmaj7 chord, perform a barre by pressing your index finger on the C-string, E-string, and bottom-A string on the 2nd fret. Let the other string ring open.
The Gmaj7 chord contains the notes G-B-D-F#.
To build a Gmaj7 chord, take the major seventh chord formula (1-3-5-7) and apply it to the G major scale (G, A, B, C, D, E, F#).
Identify the first, third, fifth, and seventh scale degrees in the G major scale, which are G-B-D-F#, giving you a Gmaj7 chord.
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