A7 Chord on Guitar
A7 = A – C# – E – G (Root, Major 3rd, Perfect 5th, Minor 7th)
A7 simplifies the already-compact A major shape down to just two fingers: X-0-2-0-2-0, with the index finger on the D string's second fret and the middle finger on the B string's second fret, while the A string rings open as the root, and the G and high e strings both ring open too. Compared to plain A major's tricky three-finger squeeze onto a single fret, A7 actually spreads its two fretted notes onto two different strings, sidestepping that specific difficulty entirely.
The added flat seventh (G natural) gives A7 the familiar dominant pull, and as the V7 of D major it drives one of the guitar's most frequently used cadences, A7 resolving to D, common across folk, country and blues repertoire built around that key. It's equally central as the I7 chord of a twelve-bar blues in A, working alongside D7 and E7 to cover the entire form, and blues and blues-rock guitarists reach for it constantly given how comfortably it sits in open position. Because it needs only two fingers and no tricky squeeze, A7 is often genuinely easier than the plain A major triad it's derived from, an unusual case (like a few other dominant and major-seventh chords in this survey) of the extended chord outranking its parent triad in ease. Its four open strings also give it a large, ringing sustain that suits both fast blues shuffles and slower, more spacious blues ballads equally well. Country guitarists in particular lean on this chord heavily, since so much of that genre's foundational repertoire sits in guitar-friendly keys like A and D where A7 does constant, reliable work as the connecting dominant.
Fingerings
Open Position
How to Practice It
Because A7 needs fewer and more comfortably spread fingers than plain A major, it's worth teaching (or learning) as an alternative entry point into the A-rooted chord family for players still struggling with the three-finger squeeze of the plain triad. Confirm each of the shape's open and fretted strings rings cleanly by checking them individually before strumming the full chord, since it's easy for a finger to lean and accidentally mute a neighboring open string in this spread-out shape. Drill the A7-to-D resolution specifically, given how frequently it appears in folk, country and blues repertoire, and also spend time on A7 as a static blues vamp, since twelve-bar blues progressions often hold a dominant seventh chord for multiple bars before moving on. Try fingerpicking A7's four notes individually rather than strumming, letting the open strings ring against the two fretted ones to hear the seventh's characteristic bluesy color clearly. Because the shape uses so few fretted notes, it's also a good candidate for adding a quick slide into the middle-finger note from a fret below, a small decorative touch that's easy to layer on top of an already comfortable chord.
Common Progressions
- V7–I in D major: A7 – D
- I7–IV7–V7 twelve-bar blues in A: A7 – D7 – E7
- A7 as a secondary dominant into D within an A major song: A – F#m – A7 – D
FAQ
- Is A7 easier than plain A major?
- Often yes — A7 spreads its two fretted notes across two different strings rather than squeezing three fingers onto the same fret the way plain A major does, sidestepping that chord's signature technical challenge.
- Why is A7 common in blues guitar?
- It's the I7 chord of a standard twelve-bar blues in the key of A, alongside D7 (IV7) and E7 (V7), and its comfortable open-position fingering with several ringing open strings suits both fast blues shuffles and slower blues ballads.
- What note is added to A major to make A7?
- A flat seventh, G natural, which creates the restless, unresolved pull characteristic of any dominant seventh chord, most naturally resolving down a fifth to D major.
- Can beginners learn A7 before plain A major?
- Yes, and some do specifically because it avoids the three-finger squeeze — learning A7 first gives a beginner a genuinely musical A-rooted chord to use immediately, with the plain triad's harder fingering tackled afterward.
- How many strings actually ring open on A7?
- Three of the six — the low E string is muted, the A string rings open as the root, and both the G and high e strings ring open as well, leaving only two notes, on the D and B strings, that need to be fretted at all.
- Does A7 pair naturally with blues turnaround licks?
- Very much so — its open, spread-out fingering leaves the picking hand plenty of room to add quick chromatic runs or bends around the shape without disturbing the underlying chord, which is exactly the kind of embellishment a blues turnaround built around the I-IV-V-I in A commonly calls for.
- How does A7 compare to E7 in terms of overall usefulness?
- Both are essential in their respective keys, so neither is more broadly useful in the abstract, though A7's slightly thinner, more open voicing gives it a somewhat lighter character than E7's fuller low-string weight, a distinction worth knowing when choosing between the two for a specific arrangement.
A7 on other instruments: A7 on Piano, A7 on Ukulele. Related: how chords are built, chord finder.