A Major chord

The A major guitar chord's notes: 1(A) - 3(C#) - 5(E)

A Major chord's recommended scales: major scale, lydian scale and the pentatonic major scale.

See the A major guitar chord in detail with midi audio sound samples!
More: the A major chord on 2nd fret and on the 5.fret.

The A minor chord

The A minor guitar chord's notes: 1(A) - b3(C) - 5(E)

A minor chord's recommended scales: Pentatonic Minor scale, Blues scale, Phrygian scale, Aeolian scale and the Dorian scale.

See the A minor guitar chord in detail (with midi audio sound samples).
More: the A minor guitar chord on fret 5 and fret 7.

The A 7th chord

The A 7th guitar chord's notes: 1(A) - 3(C#) - 5(E) - b7(G).

A7 chord's recommended scale: Mixolydian scale.

See the A seventh guitar chord in detail with midi audio sound samples!
More: the A7 guitar chord on fret 5 and fret 9.

D diminished chords

A diminished triad

The A diminished triad guitar chord's notes: 1(A) - b3(C) - b5(Eb). Adim chord's recommended scale: Whole Diminished scale.

The A diminished 7th chord

The A fully diminished 7th guitar chord's notes: 1(A) - b3(C) - b5(Eb) - bb7(F#)(or a 6. interval)

Adim7 chord's recommended scale: Whole Diminished scale.

See the Adim7 guitar chord in detail with midi audio sound samples!
More: the Adim7 on fret 5 and fret 10.

A half diminished minor 7th chord

The A half diminished minor 7th guitar chord's notes: 1(A) - b3(C) - b5(Eb) - b7(G). Recommended scales: Locrian scale and Half Diminished scale.

Examples: Am7b5 guitar chord on fret 4 and fret 10.

Other A guitar chords

Am7 chord, Amaj7, A2 (5.fret), Amaj7, Amaj7b5, A2 chord, Asus4, A7sus4, A6 chord, Am6 chord, Am9 on the 5th fret, Amaj9, Aadd9, Aadd9(no3), A6/9 chord, A7-9 (10.fret), Aaug, A+5, A7+5, A-5, A7-5, A9-5 and A11 (3.fret).