A G Mixolydian lick with the characteristic flat 7th (F natural). Classic country and Southern rock sound.
e|--5--3--5--3--2--3--| B|--5--3--5--3--3--5--| G|--4--2--4--2--------|
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The F natural (fret 2 on e string) is the key note. Resolve to G for a satisfying finish. Mixolydian is the mode of choice for country, Southern rock, and classic rock — think 'Sweet Home Alabama'.