Beyoncé's new single "Run the World (Girls)" is set to be released in the iTunes store tomorrow after a version of the song leaked earlier this week. The track, which includes a sample of Major Lazer's "Pon De Floor," was co-written by The-Dream and Beyoncé, and produced by Switch with help from the singer and Shea Taylor. Diplo, Switch's partner in the Major Lazer project, is not credited on the song. "Run the World (Girls)" will be the first taste of her forthcoming album, which does not yet have a title or release date.

Photos: Hip-Hop Royalty - Beyoncé and Jay-Z

A video for the single will premiere online tomorrow, but a very brief teaser clip for the video is available now. You can watch that trailer, in which Beyoncé appears riding a large black horse, below.

You can also stream the track, courtesy of Ryan Seacrest.

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