NEW YORK, NY - JULY 20: Eminem and 50 Cent attend the "Southpaw" New York premiere at AMC Loews Lincoln Square on July 20, 20
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No doubt about it, "See You Again" was one of the songs of the summer last year, but the radio smash would have sounded a lot different if the Wiz Khalifa/Charlie Puth collabo had landed with the MC for which it was originally intended.

50 Cent revealed that the Fast & Furious Paul Walker tribute was originally offered to longtime collaborator Eminem, but he turned it down due to his loyalty for a competing summer film: Southpaw, last July's Jake Gyllenhaal-starring boxing movie where Em and 50 rapped on three soundtrack cuts. "At the time [Eminem] had to make a decision between doing that and the song for Fast & Furious," he explained. "That record ['See You Again'] was a huge success for Wiz Khalifa and them. [Eminem] decided to do Southpaw because he was invested in the project."

Did the Shady Records exec make the wrong decision? Southpaw released three singles from its soundtrack (Em's "Phenomenal" and "Kings Never Die" with Gwen Stefani, plus Slaughterhouse's "R.N.S."), but none cracked the Top 40. Meanwhile, "See You Again" spent three months at No. 1, and earned its place as one of the biggest hip-hop hits ever.

Check out 50 detailing some classic collaborations with Eminem in our video interview below: