Monday's [article id="1621970"]"New Moon" soundtrack lineup announcement[/article] 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 [article id="1621995"]gathers together a collection of less well-known artists[/article] 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!"

With her recollection of another teen-driven movie soundtrack -- the 1996 adaptation of "Romeo + Juliet" starring Leonardo DiCaprio -- Clark can relate to the impact and influence of music introduced to kids through cinema. "I loved that album," she said. "You swear by those things and you discover bands you wouldn't have if you hadn't had this more digestible album.

Clark is gearing up for a monthlong U.S. tour alongside Andrew Bird that kicks off in Indianapolis and has her swinging through the Midwest, into the South and through the East Coast, ending in Washington, D.C. She'll be in Cleveland when the "New Moon" soundtrack drops on October 20 and, as the European leg of her tour kicks in, at a festival in the Netherlands during the November 20 release of the film.

Just don't expect Clark to bust into her "New Moon" song during one of the live shows. "I think performing 'Rosyln' requires Justin and me in the same room together."

Check out everything we've got on "The Twilight Saga: New Moon."

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