Brooklyn Rider thrives in the realm of world music and folk traditions, yet they’ve always sought to tie this impulse into their considerable classical chops—all while at the same time cultivating the ensemble as a kind of composer collective led by violinist/composer Colin Jacobsen (b. 1978). In this case, Bartók’s Second String Quartet is the glue that holds this new album together, with that work’s blend of folk sources defining the album’s musical core. The Bartók is flanked by two new compositions by present day composer-performers that further burnish Brooklyn Rider’s reputation for hip collaborations that shed light on our relationship to our roots.