To play the Absus chord, place the little finger on the 5th fret of the top g-string, index finger on the 3rd fret of the C-string, middle finger on the 4th fret of the E-string, and ring finger on the 4th fret of the bottom A-string.
The Absus chord (also known as a G#sus) contains the notes Ab-Db-Eb.
In this case, the "sus" in the chord name, which means suspended is referring to a "sus4" note.
To build an Absus chord, take the suspended fourth chord formula (1-4-5) and apply it to the Ab major scale (Ab, Bb, C, Db, Eb, F, G).
Identify the first, fourth, and fifth scale degrees in the Ab major scale which are Ab-Db-Eb, which gives you an Absus chord.
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