In a fanfic, believe it or not! Someone had quoted lines from a Runrig song at the beginning of each section of their story, and I was so intrigued I went off to find the tune. Same with Nightwish: someone rec'ed a fan video that happened to be set to their song Nemo and I was blown away. Fandom has brought me some very cool music, something which I never would have predicted or guessed :)