B7b5

— About this chord

B7b5 (1–3–♭5–♭7) delivers a slippery, tritone-flavored dominant sound, moody and unresolved with a jazzy edge. Common in jazz reharmonizations and tritone-substitution turnarounds, it also colors film-noir and lounge textures. On guitar it's a compact low-position voicing built around the open B string; pianists like its symmetrical, ambiguous spacing. Functions as V7b5 or a tritone substitute, resolving smoothly by half-step. Also searched as B7-5, Balt7b5.