Greensky Bluegrass

This Michigan-based quintet puts a progressive spin on traditional bluegrass music, augmenting mandolin and banjo arrangements with trippy light shows. While its music is a far cry from hat of the Grateful Dead or Phish, Greensky Bluegrass has found a following among jam-band fans thanks to its constantly changing setlists and extended improvisations. The group takes over the Riviera Theatre for four nights at the end of the year, joined by the Jeff Austin Band on December 28 and 29, and Horseshoes and Hand Grenades on December 30. On New Year's Eve, it's three straight sets of Greensky Bluegrass with mandolin solos galore.