About the Gmaj7 chord
To play G major 7th, use the first shape above. Place your index finger on the 2nd fret of the C string, your middle finger on the 2nd fret of the E string, and your ring finger on the 2nd fret of the A string. Leave the G string open. Strum all four strings and check that each one rings cleanly.
Root
G
Quality
Major 7th
Notes
G · B · D · F#
How the Gmaj7 chord works
G
Root(1)
The home note. It gives the chord its name.
B
Major third(3)
The major-third interval that establishes the chord's major base.
D
Perfect fifth(5)
Adds strength and stability.
F#
Major seventh(7)
Adds a major seventh above the root.