C Mixolydian scale on the guitar fretboard

The C Mixolydian scale is made of C (the root), D (major second), E (major third), F (perfect fourth), G (perfect fifth), A (major sixth) and Bb (minor seventh). The fretboard shows every one of them across the neck in standard tuning (E A D G B E), and plays them back so you can hear the scale.

The Mixolydian mode is a major scale with a lowered seventh, the fifth mode of the major scale. It shares its notes with a major scale a fifth below, so one set of positions serves both. It is the scale that fits the dominant seventh chord.