Two decades, ten albums, about a thousand gigs in thirty countries since Frigg first became a band, their same passion still burns. Hailing from Norway, the seven member, all-string group takes listeners to “art music spheres” through traditional Finnish polska, bluegrass and Balkan rhythms all in one concert; as if several different ensembles were visiting the stage at the same time! The hypnotic combination of the violin sound, and the irresistibly ringing of the double bass's pulse, to the driving melodic tones of the guitar, Frigg brings a concert varied and full of joy. Tickets: $17.50-$22.50