The "Lydian Mode" is a musical mode in Western music, belonging to the seven church modes. It is often recognized for its dreamy and ethereal quality.
In the Lydian mode, each note is assigned a specific degree within the scale, following the pattern: whole, whole, whole, half, whole, whole, half (1-2-3-#4-5-6-7). For example, in the key of C Lydian, the corresponding note names and pitches are: C (root), D (second), E (major third), F♯ (augmented fourth), G (fifth), A (sixth), B (major seventh), and C (octave).
What sets the Lydian mode apart is its major quality but with a unique characteristic: the raised fourth degree compared to the major scale. This raised fourth creates a sense of tension and instability, which contributes to the mode's dreamlike and otherworldly atmosphere. The Lydian mode is often associated with a sense of wonder and fantasy, making it suitable for creating magical or fantastical musical landscapes. It has been used in various genres including film scores, ambient music, and certain types of progressive rock.