Old Crow Medicine Show tore up the Ann Arbor Folk Festival stage last winter with its adrenaline-inducing mix of stringband music and rock attitude. Their music has the mixture of darkness, dignity, and unbridled hell-raising that marked the greatest of the old-time country groups, and in the music of Old Crow Medicine Show, the old- time tradition is renewed for the 21st century. Quite a few rough-edged, punk- flavored Southern stringbands came on the scene about five years ago, but it's becoming clear that Old Crow Medicine Show is the one with the chops and commitment to last. OCMS has fans ranging from youthful Saturday-night clubgoers in Music City to Doc Watson, who discovered them playing in front of a North Carolina pharmacy, and fiddler Ketch Secor is tough to beat for sheer forward momentum on the strings. Frequent guests on NPR's "A Prairie Home Companion," Old Crow Medicine Show comes to Michigan with a new album, "Live at the Orange Peel and Tennessee Theatre."