To play the G#maj7 chord, perform a barre by pressing your ring finger on the C-string, E-string, and bottom-A string on the 3rd fret and index finger on the 1st fret of the top g-string.
The Abmaj7 chord (also known as a G#maj7 chord) contains the notes Ab-C-Eb-G.
To build an Abmaj7 chord, take the major seventh chord formula (1-3-5-7) and apply it to the Ab major scale (Ab, Bb, C, Db, Eb, F, G).
Identify the first, third, fifth, and seventh scale degrees in the Ab major scale, which are Ab-C-Eb-G, giving you an Abmaj7 chord.
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