Abm(add9) Chord on Guitar
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Major chords [chords based on a major triad]
CC(add9)C6C6/9Cmaj7Cmaj7(9)Cmaj7(13)Cmaj7(#11)Cmaj7(#5)C7C7(9)C7(13)C7(b9)C7(#9)C7(13,b9)C7(b13)C7(#5)C7(b9,b13)C7(#11)C7(b5)Minor chords [chords based on a minor triad]
CmCm6Cm6/9Cm(add9)Cm7Cm7(9)Cm7(11)Cm7(13)Cm7(b13)Cmmaj7Cm7(b5)Cm7(11,b5)Sus chords [3rd suspended and replaced by a 4th or 2nd]
Csus4Csus2C7sus4C7sus4(9)C7sus4(b9)C7sus4(13)Augmented chords [major chords with augmented 5th (#5) ]
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- m maj dim aug
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The Abm(add9) chord is a minor chord with an additional 9th, but without a 7th (which would be inluded in the Abm9 chord). The Abm(add9) chord consists of the tones Ab (1), Cb (m3), Eb (5) and Bb (9).
The tone Bb is written as 9 and not 2, because 9 is a chord extension, while 2 means a modification of the base chord and only exists as sus2 that would replace the 3rd.
Unlike major chords, that are dramatically changed by adding a 7th, minor chords can in most styles be played with a 7th even if it just a plain minor chord is written. Or the other way round: played without a 7th, although the chord symbol says m7. Conclusion: m(add9) chords are mosty a result of playing a m9 chord in a way that doesn’t leave space for a 7th on the guitars fretboard. In most cases you should prefer writing a Abm9 chord on your music sheet and then just play it with or without the 7th depending on your chord shape respectively voicing (order of intervals).
moveable
You can transpose these chord shapes to any different key just by moving the whole chord shape along the guitar fretboard until the squared spot represents the new root.
capodaster
The pleasant sound and sometimes easier playability of an open chord can be put into practice by mounting a capodaster on the indicated fret. Of course that may goe along with the disadvantage of not being able to use the frets lower than the capo anymore.
