Monty Brinton/CBSYou may have seen Annie Lennox belt out her version of “I Put a Spell on You” on Sunday night at the Grammy Awards, and if you go to see the hotly anticipated movie Fifty Shades of Grey, which opens this Friday, you’ll hear it again: It’s the first song in the film. The former Eurythmics frontwoman is not exactly a Fifty Shades fan, though, and she says it’s a “fluke” that her song even ended up in the movie.

Speaking to Spin magazine, Lennox says she knows the movie’s director, Sam Taylor-Johnson, but when they asked her for a song for the film — a different song — her reaction was, “I’m not really sure about that.” Still, she agreed to drop by the studio and talk to the filmmakers, and when she got there, she discovered that one of the editors had put “I Put a Spell on You” over the opening sequence, just to see how it would work, and everyone was pleasantly surprised.

“We all came in — about a half a dozen of us in the room — and it fit like a glove,” she tells Spin. “There was just a sort of a sharp intake of breath after he played it. Everybody said, ‘Well, that has to be it. That’s perfect.’ It was just a done deal, it was like, ‘Yes! That works.'” However, Annie says she still wasn’t convinced it’d make the final cut.

“Things change in film, so I wasn’t really expecting them to use it, and yeah, it’s there!,” she adds. “You’ll see if you go to the film, it’s there at the very opening.” While she hasn’t seen the entire movie, she says she trusts that Wood has “done a very elegant job with it.”

As for her opinion on the Fifty Shades erotic novels on which the film is based, Lennox tells Spin she’s never read them.

“I wasn’t, interested in them, to be frank with you,” she explains. “Quite often when things are super-popular, I kind of catch up with them years later. I kind of avoid that.”

Lennox’s rendition of “I Put a Spell on You,” the classic 1956 blues-rock song by Screamin’ Jay Hawkins, is on the Fifty Shades of Grey soundtrack album, in stores now, as well as on Annie’s current, Grammy-nominated covers album, Nostalgia.

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