B.J.'s Port, a cozy neighborhood bar in Five Points, features jazz only on Sundays, from 4 to 8 p.m. But what music! Pat Bianchi, a hard-driving young jazz organist, leads a smokin' trio composed of the fine Boulder guitarist Bill Kopper and drummer Tony Black, a whirling dervish with the quickest sticks in the business. On vocals you've got singer/actor Ed Battle, who's a Denver institution and a blues master. Saxophonist Billy Tolles may fall by to sit in, along with other Denver jazz players with time on their hands. Hungry? How about some barbecue, with a mess of collard greens and crowder peas? All this, and the sun hasn't even set.