The Grapevine, a folksy bar and grill situated in downtown Scottsdale, is the place where local karaoke singers go when they get serious about their much-maligned craft. Besides being one of a handful of Valley venues where karaoke is offered every night of the week, The Grapevine also features the inimitable talents of disc jockey Bobby Cook, a veritable one-man band who'll blow a real sax solo during your little Motown fantasy or rosin up a genuine fiddle between your verses of "The Devil Went Down to Georgia." For the audience, too, Cook's live accompaniment sure beats staring in nervous anticipation at a slide reading "Instrumental Break -- 16 Bars" while singers gulp down a little more of that liquid inspiration before the final chorus.