Music is a big part of what puts "Fifty Shades of Grey" author E.L. James in the mood to write the steamy sex scenes that made her trilogy a bestseller.

She is celebrating that by releasing "Fifty Shades of Grey: The Classical Album" on Sept. 17. The record is a compilation of classical pieces that inspired James as she wrote.

The author dished to Business Insider about her passion for classical music and why she chose to incorporate it into "Fifty Shades."

"I'm listening to [classical music] all the time. It's music to f--- to. We all want that," she said.

The book's protagonist, Christian Grey, plays piano and enjoys classical music from early in his life.

But classical tunes aren't the only thing that gets James going. When asked what music she thinks is best for sex, James gave a surprising answer - the Black Eyed Peas.

"These things are in the eye of the beholder. I have songs that I write sex to. One of them is the Black Eyed Peas' 'Sexy.' That's a very sexy song. And that's all I'm prepared to tell you. Because if I told you the other ones you wouldn't believe it," she said.

James' trilogy continues to dominate the publishing world and the bestseller lists. Barnes and Noble directly credited the books with the company's profits for 2012's second quarter, and retailers say the series is behind a spike in the sale of sex toys nationwide.

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Fifty Shades Of Grey