Chord sequence
D♯m7 G♯7 C♯maj7
In every key
Four-note rootless voicings in their two forms, with the 3rd or the 7th on the bottom, played over the root.
Heard in C# major
All the chords
The most common cadence in jazz: a ii-V resolving to the major 7th tonic.
Over D#m7 · ii7
Mode 2 of Major
Over G#7 · V7
Mode 5 of Major
Over C#maj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.