As leader of the Soulard Blues Band, Art Dwyer is the organizing force behind one of St. Louis' most popular and enduring groups of the past 25 years. So it should come as no surprise that Dwyer's got a wide knowledge of blues, R&B, soul and jazz. His great taste in tunes carries over to his KDHX radio show, Blues in the Night, which airs on Friday from 4 to 6 p.m. on 88.1 FM. Dwyer's also got a true showman's sense of timing: He knows when to let the music play and when to break things up with a shout-out to a listener, a morsel of folksy wisdom or a fast bit of patter. Though it probably wouldn't survive on commercial radio, Dwyer's program has become an indispensable part of Friday afternoons for many St. Louisans. And so it shall remain for many years to comethe good Lord willin' and the creek don't rise.