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|G Dominant 7 chord intervals and notes|
|Intervals||1 - 3 - 5 - b7|
|Notes in G 7||G - B - D - F|
7th chords have a minor 7th added to the base major chord, possible to play with an omitted 5th degree note. 7th chords are used very often in blues music.
Here are 6 voicings of the G7 guitar chord, with a chord chart to each voicings' fingering.
Dead strings and fret buzzing means you are not holding down the guitar chord correctly. Stop, check your fingers, and start over.
When learning new chords, make sure you know at least their major, minor, 7, minor 7, and sus variations.