Old-time bluegrass enthusiasts Old Crow Medicine Show got their start busking on street corners in New York and Canada, eventually landing in Nashville for a residency at the Grand Ole Opry, where they entertained the crowd between shows. Fifteen years after these humble beginnings, the band has released four studio albums and sold more than 800,000 albums. Frequent guests on “A Prairie Home Companion,” Old Crow Medicine Show won an audience on the road with their boundless energy and merry throwbacks to the days of rambling string bands. On their spirited new album, Carry Me Back, the group continues to raise a jug of moonshine to the spirit of classic Americana.