"Guess who? Did you miss me?"

Staying on top of album news for partners-in-rhyme Eminem, 50 Cent, and Dr. Dre continues to be a confusing endeavor, but here are some new, hopefully enduring details: Eminem's album should see the light of day before Fiddy's; a video for the trio's hot collaborative single, "Crack a Bottle," should emerge within a few weeks; and "Crack a Bottle" will appear on Em's album, not 50's.

It's official. Music really does bring people together. Usually, collaborations occur between the sonically likeminded, but recently a whole spree of batshit-crazy partnerships have popped up. So hold onto your hats and glasses folks, as we look at the latest odd couples to step inside the studio:

We've all been wondering when Eminem's new album Relapse will finally come out. And lo and behold, Queens-bred hip-hop star 50 Cent has surfaced at the Sundance Film Festival to offer his insight.

We've heard a tune from Eminem's forthcoming album, Relapse, but now fans eagerly awaiting Dr. Dre's decade-in-the-making record Detox have something to hold them over until its release: "Could Have Been You," a song featuring rhymes from 50 Cent, R. Kelly, and Aftermath crooner Bishop Lamont.

Originally titled "Number One" when leaked as an incomplete demo last November, Eminem's first official album track, "Crack a Bottle" (listen below), surfaced online yesterday. What changed? The final version features verses from frequent collaborators Dr. Dre and 50 Cent.