For the Tibetan Mastiffs living on Snow Mountain, a dog's life has a simple riff: Guard a peaceful village of wool-making sheep from the thuggish wolf Linnux and his rabid pack. To avoid distractions, Mastiff leader Khampa forbids all music from the mountain. But when Khampa's son Bodi discovers a radio dropped by a passing airplane, it takes just a few guitar licks for his fate to be sealed: Bodi wants to be a rock 'n' roll star.

Poppy and Branch discover that they are but one of six different Trolls tribes scattered over six different lands and devoted to six different kinds of music: Funk, Country, Techno, Classical, Pop and Rock. A member of hard-rock royalty, Queen Barb, aided by her father King Thrash, wants to destroy all other kinds of music to let rock reign supreme. With the fate of the world at stake, Poppy and Branch set out to visit all the other lands to unify...