The Lydian dominant scale is a unique and colorful musical scale used primarily in jazz and fusion music. It combines the bright, floating sound of the Lydian mode with a dominant seventh chord quality, making it perfect for adding tension and sophistication to improvisation and composition.

Technically, the Lydian dominant scale is the fourth mode of the melodic minor scale. For example, if you take the G melodic minor scale (G, A, B♭, C, D, E, F#), the Lydian dominant scale starting on its fourth degree (C) would be: C, D, E, F#, G, A, B♭. The key characteristics are:

• A raised 4th (or #11) – this gives the scale a bright “Lydian” flavor.
• A flat 7th – creating the dominant 7th chord sound.

This scale is often used over dominant 7th chords, especially those with altered tensions like #11. It works well in V7 chords when resolving to a minor or major tonic, imparting color beyond the traditional Mixolydian sound. Jazz musicians favor it in modal playing, bluesy lines, and when they want to suggest a more modern, sophisticated harmony.

In summary, the Lydian dominant scale is a versatile tool for soloists and composers looking to enrich dominant chords with a hint of brightness and complexity, standing out from more common scales while maintaining a clear dominant function.