Elton John On Eminem Album?

Some of the guests on Eminem's upcoming Relapse — 50 Cent and Dr. Dre, for instance — are pretty obvious. But the latest rumoured contributor is a bit surprising.

Sir Elton John visited Eminem (real name Marshall Mathers) at a Detroit recording studio last year and they may have recorded some material together that could end up on Relapse, according to Britain's The Independent newspaper.

"[John] stayed half a week," a source told the paper. "No one realised the significance, though the Detroit Free Press did mention that Elton had been in town.

"He and Em worked together before, when they did that duet at the [2001] Grammys, and had always said that they'd record something original together. Em has huge respect for Elton, and the feeling is mutual."

The source added that "anything they produce will be total dope."

John and Eminem performed together at the Grammy Awards after some accused the rapper of homophobia.

Relapse was originally supposed to be released late last year, but was pushed back and is expected in stores sometime this year. Eminem's last studio album was 2004's Encore.

Here's Eminem and John's 2001 Grammys performance of "Stan," complete with an awkward hug at the end: