D#7b5

— About this chord

D#7b5 (Eb7b5) flattens the 5th of the dominant chord for a woozy, tritone-leaning tension often used as a substitute dominant or a chromatic passing chord in jazz harmony. It shares two notes with its tritone-substitute partner, making it a handy reharmonization tool in ii-V-I turnarounds and modern jazz comping. On guitar it's a compact A-shape grip; on piano it voices naturally as a French augmented-sixth-like cluster. Also searched as Eb7b5, D#dom7b5, tritone dominant.