The Band with Rocks In
Band from the the 1994 fantasy parody novel Soul Music, by Terry Pratchett, the sixteenth of his Discworld novels. There was an animated television miniseries adaptation, Soul Music in 1997.
Harpist and bard Imp Y Celyn travels to the big city of Ankh-Morpork and falls in with fellow musicians troll Lias Bluestone and dwarf Glod Glodsson. One mysterious magical guitar later, they inadvertently invent rock and roll.