The dominant seventh chord is a chord having a root, major third, perfect fifth, and minor seventh.
A7 OpenHere’s the chord in it’s open form. | Barred VersionHere’s the same chord shape barred. Now we can “carry” the chord shape up the neck to transpose the chord shape.
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Fret/Chord Chart
You can determine the name of the chord when the root (lowest) note is
played on the frets in the chart below.
| Fret | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Chord | A#/Bb | B | C | C#/Dd | D | D#/Eb | E | F | F#/Gb | G | G#/Ab | A |
Exercise
Play the A style dominant 7th barre chord on the first 12 frets starting
on the 1st fret. Listen to this exercise in the audio example below. You
may want to say the names of the chords as you travel up and down the
fretboard to help you remember them.