A mixolydian

Construction

Step pattern (W = whole step, H = half step): W-W-H-W-W-H-W.

Formula (intervals from the root): 1-2-3-4-5-6-b7.

Mixolydian is a major scale with the 7th lowered by a half step. That b7 removes the leading tone -- the half-step pull to tonic that defines major-key resolution -- and turns the dominant seventh chord into a point of rest rather than tension.

Origin and Relationships

Mixolydian is a mode -- a scale derived by starting a parent scale from a different degree. It belongs to the diatonic modes family, derived as the 5th mode of the major scale.

• Parent: the major scale starting from its 5th degree. To find the parent, go up a perfect fourth (or down a perfect fifth) from the Mixolydian root.
• Compare to Ionian: Mixolydian has b7 where Ionian has a natural 7. Without the leading tone, there is no half-step resolution to tonic -- phrases settle on a dominant seventh chord without needing to move.
• In functional harmony (where chords have roles like tonic, dominant, and subdominant), Mixolydian is the scale of the V chord in any major key. But when you make the dominant seventh chord itself the tonic -- as in blues, rock, and folk -- that is Mixolydian as a modal sound rather than a functional one.

Harmonic Context

In Roman numeral analysis (uppercase = major, lowercase = minor):

• I7 (dominant seventh): Tonic. The dominant seventh chord at rest -- not seeking resolution, just sitting in its own bluesy warmth. This is the core Mixolydian sound.
• bVII (major): A whole step below tonic. The most common secondary chord in Mixolydian progressions and a natural departure point.
• IV (major): Standard subdominant function. Together with bVII, it forms the backbone of Mixolydian cadences.
• v (minor): The minor v has no dominant function -- the b7 removes the leading tone that a major V would need. This is why Mixolydian stays modal.

Characteristic Tones

The intervals that give Mixolydian its distinctive sound:

• b7 (minor seventh): The defining Mixolydian tone. It sits a whole step below tonic instead of a half step, removing the upward pull that defines major-key resolution. Compare to Ionian: the natural 7 drives melodies toward tonic, while the b7 lets them hover. The 3-to-b7 interval is a tritone (6 half steps) that gives the I7 chord its dominant color, but in modal context that color is stable, not restless.
• 3 (major third): Keeps the mode bright and major-sounding. The combination of major 3rd and b7 is what produces the dominant seventh quality that defines blues, rock, and folk harmony.

Melodic Applications

Lead with the b7 to signal Mixolydian immediately -- without it, listeners hear plain major. The 3-to-b7 tritone sits comfortably inside the tonic chord rather than demanding resolution. Over dominant seventh chords that function as tonic (blues turnarounds, rock vamps), Mixolydian is the natural scale choice. In blues, combining Mixolydian with the minor pentatonic creates the major/minor blend that defines blues guitar vocabulary -- the b7 shared by both scales is the bridge between them.

Practice Seeds

b7 vs. natural 7. Play a phrase with b7, then replay it with a natural 7 (Ionian). Hear how the b7 removes the urgency to resolve -- melodies can rest on the dominant chord instead of pushing past it.

Dominant as tonic. Vamp on a single I7 chord and improvise in Mixolydian. Experience the dominant seventh as home -- stable, warm, and complete without needing to resolve anywhere.

Blues connection. Play Mixolydian over a blues I chord, then mix in minor pentatonic phrases. Hear the overlap -- both scales share the b7, and blending them is the core of blues guitar vocabulary.

Rock cadence. Play I7-bVII-IV-I7 as a loop. Internalize this characteristic Mixolydian progression -- it powers countless rock and folk songs and captures the mode's personality in four chords.