Here's How 'Fifty Shades Of Grey' Got That Sexy New Spin On Beyonce's 'Crazy In Love'

Boots is behind it. We should have guessed.

The "Fifty Shades of Grey" trailer is here. We'll give you ample time now to swoon and faint and drool and writhe around on the floor in exquisite agony.

OK. Done now? Cool. Now let's talk about the music that scores the trailer, featuring a slowed-down, super-sexy version of Beyoncé's "Crazy In Love" -- and the fact that Bey teased the whole thing on Instagram.

Related: 15 Spoilers Revealed In The 'Fifty Shades Of Grey' Trailer

"Where did that string-filled tune come from?" you might ask. "And how is Bey involved?" Simple. The music came from the mind of Boots, who produced the majority of Beyoncé's most recent, self-titled record in addition to writing some hit tracks. He also scored the anticipation-laden "Shades" trailer for the hit book-to-movie.

"Scoring films is something I've always felt like I was going to do, so I jumped at the opportunity to be a part of this," Boots told MTV News.

The musician -- who took his name from his predilection for the footwear -- entered the music world as kind of a mystery when Bey dropped her record (surprise!) last December. We saw his name all over the track list, but we weren't really sure who he was or how he hooked up with Queen Bey in the first place.

Soon, more and more information came to light about the musician -- including his real name (Jordy Asher) and his past involvement in bands like Blonds -- and he eventually dropped a record of his own: a mixtape titled WinterSpringSummerFall in May. He premiered the excellent effort on Buzzfeed with the simple statement: “So for the first and last time, here’s my whole story from the beginning."

Well, it looks like Boots has added a new chapter to the aforementioned story, one that involves movies, and wildly popular ones at that.

The end of the trailer promises that an exclusive version of "Crazy In Love" -- with new vocals from Bey -- will be coming soon.

We'll be looking forward to hearing that as well as whatever else it is that Boots has up his sleeve.