About the C sharp Scriabin scale
C sharp Scriabin is used for impressionist and mystical concert music. Think of it as a five-note scale from the late, mystical harmony of Scriabin. It is C♯ Major Pentatonic with the second lowered.
Its notes are C♯, D, E♯, G♯, and A♯. The formula is H 1½ 1½ W 1½.
Also called Major Pentatonic ♭2 and Vibhas.
On the piano, C♯ Scriabin touches the black keys C♯, G♯, and A♯.