A# lydian dominant

Construction

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

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

Lydian Dominant is Mixolydian (the major scale with b7) with a raised 4th, or Lydian (the major scale with #4) with a lowered 7th. It combines dominant function (the b7) with Lydian brightness (the #4), producing a sound that floats rather than drives. This scale belongs to the melodic minor family.

Origin and Relationships

Lydian Dominant is a mode -- a scale derived by starting a parent scale from a different degree.

• Parent: the 4th mode of melodic minor. From the Lydian Dominant root, go down a perfect fourth (or up a perfect fifth) to find the parent melodic minor key.
• Compare to Mixolydian: both share 1-2-3-5-6-b7, but Lydian Dominant has #4 where Mixolydian has a natural 4. That raised 4th removes the subdominant pull and replaces it with an upward-floating brightness.
• Compare to Lydian: both share the #4, but Lydian has a natural 7 (major function) where Lydian Dominant has b7 (dominant function). The altered scale (7th mode of the same melodic minor parent) serves V7 where Lydian Dominant serves bII7 -- same notes, different root.

Harmonic Context

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

• 7#11 (dominant #11): The essential Lydian Dominant chord. The #4 sits in the voicing as #11, giving the dominant a bright, non-aggressive quality.
• IV7 in major: On the 4th degree of a major key, Lydian Dominant creates a non-functional dominant -- a dominant chord that sits without needing to resolve. The #4 of the scale equals the leading tone of the parent major key, which is why it feels at home.
• Tritone substitution (replacing a dominant chord with another dominant a tritone away): bII7 chords commonly use Lydian Dominant. The #11 of the tritone sub equals the root of the original V7 chord it replaces -- this shared tone is what makes the substitution work smoothly. Play the altered scale over V7 and Lydian Dominant over bII7 and you are playing the same seven pitches from different roots.
• 13#11: The full extended voicing. Rich and sophisticated, a staple of jazz comping.

Characteristic Tones

The intervals that give Lydian Dominant its distinctive sound:

• #4 (raised fourth): The defining tone. From the root to #4 is a tritone (6 half steps), but in the Lydian context it sounds bright and expansive rather than tense. It eliminates subdominant gravity -- the natural 4th's tendency to pull the ear back toward the tonic's lower neighbor -- replacing that pull with an upward-floating quality.
• b7 (minor seventh): Establishes dominant function. The combination of #4 and b7 is what separates this scale from both Lydian (major function) and Mixolydian (driving dominant).
• 3 (major third): Completes the dominant triad. Together with b7 and #4, it forms the Lydian Dominant fingerprint: a dominant chord that hovers rather than pushes.

Melodic Applications

Target the #4 on strong beats to establish the Lydian color over any dominant chord. The #4 eliminates the downward pull of the natural 4th, so phrases float rather than resolve downward. Over tritone subs, lean on the #4 to highlight the connection to the original dominant -- it is the shared anchor between the two chords. The result is bright and sophisticated, less aggressive than standard Mixolydian.

Practice Seeds

Find the #4. Emphasize the #4 over a dominant 7th chord. Hear the Lydian brightness enter the dominant sound -- one raised degree transforms the character from driving to floating.

Melodic minor connection. Play the melodic minor scale from a perfect 5th below the root, then start from the 4th degree. Hear the Lydian Dominant emerge from the same seven notes -- understanding this parent relationship unlocks the scale in every key.

Tritone sub application. Play Lydian Dominant over a bII7 resolving to I. Notice how the #11 is the root of the V7 being replaced -- this connection is the theoretical engine behind tritone substitution.

Mixolydian comparison. Play Mixolydian and then Lydian Dominant over the same dominant chord. Hear how the #4 lifts the sound from grounded and bluesy to bright and floating -- one note, completely different attitude.