Monday's "New Moon" soundtrack lineup announcement has ushered into the vaunted "Twilight" musical universe a whole new cast of artists. This year's big names include the Killers, Thom Yorke of Radiohead, Muse and Death Cab for Cutie.

The soundtrack also gathers together a collection of less well-known artists with a ton of indie cred. St. Vincent (real name Annie Clark) — who has been making a name for herself with solo albums and collaborations with Sufjan Stevens — hooked up with Bon Iver's Justin Vernon for the track "Rosyln."

"He sings in his beautiful falsetto and I'm actually singing very, very low," Clark told MTV News. "I think there's something vampirey and creepy about the two of us singing together. It's a simple, stripped-down kind of song. It's really elegant and beautiful."

Clark and Vernon had been talking about collaborating together for a while, and when Vernon wrote "Rosyln," neither he nor Clark had any idea the track would end up on the "New Moon" soundtrack. "We recorded the song for the joy of it, and then it looked like the 'Twilight' people were interested in using the song for the movie," she explained. "So it pretty naturally happened."

Unlike with the original soundtrack, all the music on "New Moon" is original and exclusive to the soundtrack.

While Clark has only just joined the "Twilight" family, she's been familiar with the books since she kept spotting them in the hands of her older sisters and counts herself as a fan of the movie. Her true pop-culture supernatural allegiance, though, belongs not to vampires or werewolves but to the occult, as a result of her teenage obsession with "The Craft," the Neve Campbell-starring flick about suburban witches.

"We were influenced to be vaguely goth — still mainstream but, like, mall-clothes goth," she laughed. "It was awesome!"