While it won’t get you smashing Guinness bottles like their raging live show, this sleek, postmodern take on traditional Scottish and Emerald Isle songs is a decent download for those who enjoy galloping violins and barstool ballads. There are also a few testaments to the group’s deeper roots, such as the barbershop folk of “Another Round,” the overcooked pop of “Minstrel Boy,” and the light frat-rock of “Down With the Ship,” which might as well be a Guster song