The G7 Guitar Chord (also known as a Dominant G 7th Chord) is found in the G Major Scale: G A B C D E F# G. It is made up of the 1, 3, 5 and b7 positions of this scale. Meaning the notes G, B, D and F. The “b7” symbol translates to a “flattened 7th” which simply means that we take the 7th step of the G Major Scale, “F#” and flatten it by a 1/2 step to arrive at our “F” note.
This chord is often referred to as a Blues chord. Once you learn to play it, you will understand why. It just has a real bluesy sound to it.
G7 Chord notes: G B D and F
You can see just how to finger this chord by referring to the diagram chart below.