What is surprising is the location of the Sain/Little Milton performance, BB's. Campbell, who still records regularly for the Malaco label and tours often, is usually found playing outdoor festivals or much larger venues. So it's a rare opportunity to hear him perform in a small-club setting -- especially in the company of his longtime compatriot Oliver Sain. You can bet that the two musicians (backed by Sain's fine band, the R&B All Stars), will turn back the clock to perform some of the Little Milton hits they collaborated on decades ago -- for instance, "I'm a Lonely Man" and "So Mean to Me." And given the rarity of this pairing in the small club atmosphere of BB's, there's no telling what other local musical legends might turn up to be part of the show. Admission is $15, and the music begins around 9 p.m.