The A major chord is built from a root note (A), a major third (C), and a perfect fifth (E):
- Type: major triad.
- Formule: 1 3 5.
- Music notes: A (1) C# (3) E (5).
- Chords to play with: IV (D) y V (E).
A chord [Musical explanation]
The A major chord is a major triad with formula 1 – 3 – 5. Therefore, to build it we need A (1), C# (3), E (5):
This is due to the fact that a major chord is made up of 2 third intervals:
- A major interval (4 half steps between the 3rd and root).
- A minor inteval (3 half steps between the 5th and 3rd).
If we apply this principle to the A chord we obtain that:
- C# is the major third of A because it is 4 half steps above the root.
- E is the perfect fifth of A because it is 3 half steps above the 3rd.
Thus, this confirms that the A major chord is defined by:
Root (A) – Major Third (C#) – Perfect Fifth (E)
A Guitar Chord
The A chord guitar has the following shape on the fretboard:
Let’s analyze in detail this chord diagram above to make sure that we understand how to play the A on guitar:
Let’s start by analyzing the 3 circles in blue, which indicate that on the strings 4 (D), 3 (G) and 2 (B) we have to place the fingers 1 (index), 2 (middle) and 3 (ring finger). Note by the way the number 1 in black on the left that indicates on which fret we start playing the chord.
On the other hand, at the top we see that we have the characters:
X A E A C# E
This simply means that in the:
- Sixth string there is no sound.
- Fifth string sounds the A note.
- Fourth string sounds the E note.
- Third string sounds the A note.
- Second string sounds the C# note.
- First string sounds the E note.
And at the bottom we find the numbers:
1 5 1 3 5
This indicates that in the:
- Sixth string There is no number because there is no sound.
- Fifth string sounds the root (1).
- Fourth string sounds the perfect fifth (5).
- Third string sounds the root (1).
- Second string sounds the major third (3).
- First string sounds the perfect fifth (5).
⚠️ Important: it is not mandatory to memorize all this information to play the A chord on guitar. But it is highly recommended to know it in order to understand the musical theory behind each chord.
By the way, I have noticed that lately the A major chord on guitar is played by interchanging fingers 1 and 2, as shown below:
Other ways to play the A guitar chord
In addition to the diagram shown at the beginning of the article, we can also find the A chord in the following fretboard positions:
A major triad chords and inversions
First Inversion (A /C#)
Second Inversion (A /E)
What chords are in A major?
The A major scale harmonized results on the following chords:
A (I) – Bm (ii) – Cm (iii) – D (IV) – E (V) – F#m (vi) – Gº (viiº)
A Ukulele Chord
Here you can see as well the A uke chord diagram:
A Piano Chord
To play the A chord on piano we only need to find the same music notes on its keys:
First Inversion (A/C#)
Second Inversión (A/E)
Music scales in which the A major chord can be found
- A major scale (harmonized with triads)
- A Bm D♭m D E G♭m A♭dim
- E major scale (harmonized with triads)
- E G♭m A♭m A B D♭m E♭dim
- D major scale (harmonized with triads)
- D Em G♭m G A Bm D♭dim
- F# minor natural scale (harmonized with triads)
- F#m G#dim A Bm C#m D E
- C# natural minor scale (harmonized with triads)
- C#m D#dim E F#m G#m A B
- B natural minor scale (armonizada por tríadas)
- Bm D♭dim D Em G♭m G A
- D harmonic minor scale (harmonized with triads)
- Dm Edim Faug Gm A B♭ D♭dim
- C# harmonic minor scale (harmonized with triads)
- C#m D#dim Eaug F#m G# A Cdim
- E melodic minor scale (harmonized with triads)
- Em G♭m Gaug A B D♭dim E♭dim
- D melodic minor scale (harmonized with triads)
- Dm Em Faug G A Bdim D♭dim
A Major Chord PDF
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