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Eminem is definitely one of the most sought-after rappers in the game. So, when Tech N9ne was looking for guests to appear on his upcoming Special Effects album, he had to find Marshall Mathers, someone he's been trying to collaborate with for years.

"I've been wanting to work with Eminem for a long time," Tech N9ne told HotNewHipHop about their collaboration, "Speedom (WWC2)." "It's funny saying this on the mic 'cause I haven't been able to say this to anybody, [but] Eminem finally came through and blessed me with a 24-bar verse, when I only needed a 16."

Yep. Not only did Em deliver his verse, he also unleashed more than Tech asked for.

"He felt it that much," Tech explained. "It's a track that's paying homage to Richie Havens, rest his soul... It's such a massive and beautiful song. It's really personal to me because of [folk singer] Richie Havens and that long-awaited Tech N9ne/Eminem collaboration everyone always wanted."

The Seven-produced track, which also features a hook by Strange Music's Krizz Kaliko, is just one of the many collaborations on the upcoming Special Effects album. According to the Strange MC, the project is also slated to feature Lil Wayne, 2 Chainz, T.I., Slipknot's Corey Taylor and Hopsin, among others.

But the Em collaboration is huge because fans have been waiting on this duet for years. In 2011, Tech N9ne revealed to HipHopDX that they were supposed to team up on the independent titan's "So Lonely" cut off his All 6's & 7's album.

That didn't pan out, but it looks like they finally connected again following their 1999 collaboration "The Anthem," which appeared on Sway & King Tech's This Or That compilation album.

And it just might be one of the fastest Eminem verses we've ever heard. The track's title, "Speedom (WWC2)," indicates speed and the 'WWC2' could stand for "World Wide Choppers 2," a track Tech hinted towards in January.

Special Effects is set to be released May 4, through Strange Music.