The dominant 7 arpeggio contains the following:
1 – 3 – 5 – b7
It is the ‘flat 7th’ that gives the dominant 7 arpeggio its distinctive sound. It is a great tool when used over dominant 7 chords and when used with scales such as the mixolydian mode.
Just like any arpeggio or scale that we learn, we want to be able to play the dominant 7 arpeggio in 5 movable positions up and down the guitar fretboard. Let’s look at the 5 dominant 7 shapes using C dominant 7 as the example key: