Understanding the A7 Chord on Guitar

The A7 chord is a staple in the world of music, especially in genres like jazz, blues, and rock. This chord is not only fundamental for many guitarists but also intriguing for those who might be new to chord theory. Let's dive into the details of what an A7 chord is and how to play it on guitar.

What is an A7 Chord?

The A7 chord, or A dominant 7th chord, is a type of seventh chord. It consists of a root (A), a minor third (C), a perfect fifth (E), and a minor seventh (G). Therefore, the complete chord is A-C-E-G. This chord is often referred to as an "A augmented 7th" because it has a diminished fifth, making it a compound interval, and it includes a flatted seventh.

Notation and Theory

Jazz players and composers might use the notation "A7" or "A alt7". The latter might suggest different voicings or extensions, which can be subjective and can vary among players. In formal notation, an A7 chord is typically written as A - C - E - G - Bb.

How to Play the A7 Chord on Guitar

Playing the A7 chord on guitar can be broken down into a few simple steps. First, let's start with the standard tuning (EADGBE from low to high).

Placement on the Fretboard

When looking at a guitar neck, the A7 chord can be played in multiple forms. One common and basic fingering is as follows:

E (6th string) - 3rd fret (index finger) B (5th string) - 2nd fret (middle finger) G (4th string) - 2nd fret (middle finger, same as B string) D (3rd string) - 3rd fret (index finger) A (2nd string) - Open E (1st string) - Not played

This fingering is just one way to play the A7 chord, and it's a good starting point for beginners. However, there are other ways to play it, each with its own unique sound and feel.

Conclusion and Further Exploration

Understanding and mastering the A7 chord is an essential skill for any guitarist. Whether you are diving into jazz standards, blues classics, or rock songs, the A7 chord provides a rich harmonic foundation. Experiment with different voicings and fretboard positions, and you'll find that this small yet powerful chord can create a multitude of musical possibilities.