NIGHTCAPS, BLACK CAT ORCHESTRA, DJ KENTO (Sunset Tavern) I hated the cocktail-retro craze of a few years back, but even when you couldn't order a drink around here without feeling the wind off the lapels of some tech-support kid's zoot suit, Nightcaps were soulful, sharp, and--with frontwoman Theresa Hannam's sultry voice capable of boiling ice--seductive. With the Downer Trio's Bill Herzog on bass and lounge favorite Monty Banks tinkling on the keys, this is a most professional party band. The Black Cat Orchestra fronts a different kind of retro chic, circa 1928 Budapest, to make this a diverse and richly conjured evening of atmospherics. Bartender, a bucket of Courvoisier VSOP. GRANT COGSWELL