The Mixolydian scale (or mode) is very close to the major scale since it has only one different note. It has a b7 (lowered seventh). This specific note makes it sound great over 7th chords and other forms of dominant chords (9th and 13th). It is widely used in jazz, funk, blues and rock.

The mixolydian mode is the fifth of the seven musical modes. To create a G mixolydian scale you would play a C major scale starting from G going to G. In other words; it shares the exact same notes as the C major. Like any modes the chords it is played over will determine it’s modal nature.

The intervals are:
1-1-1/2-1-1-1/2-1

The scale degress:
1 (Root)-2-3-4-5-6-b7

Here are the scale patterns: