Screen Shot 2015-07-01 at 3.32.47 PM Yonder Mountain String Band make their own rock-influenced brand of progressive bluegrass, which they’ve been doing since forming in Nederland, Colo., nearly 20 years ago. Original members Adam Aijala (guitar and vocals), Ben Kaufmann (bass and vocals) and Dave Johnston (banjo and vocals) team up with new bandmates Jake Joliff (mandolin) and Allie Kral (fiddle) to win over audiences beyond traditional bluegrass fans, thanks in part to their high-energy live performances with plenty of jamming tendencies. A couple of weeks ago, they put out their sixth full-length album, Black Sheep (stream it below)—their first as a conventional five-piece bluegrass lineup—and people have taken notice. “They’ve always been one of bluegrass music’s most versatile acts,” according to Glide magazine, “but YMSB is perhaps even more adaptable now, and this album is a strong opening statement in their new musical life.” Brooklyn Bowl celebrates its sixth birthday on Tuesday, and Yonder Mountain String Band (below, doing “Black Sheep” for Second Story Garage) get the party started that night.