5. Dr Dre didn't know Eminem was white when he decided to work with him.

Eminem made no secret of the difficulty he felt he faced being a white man trying to make it in black-dominated industry, but he managed to get signed by Dre and go on to become one of the world's best rappers. In a past interview with Vibe Magazine, Dre revealed: "when I heard Em for the first time, I didn't even know he was White. I just knew I wanted to work with him. And that kind of actually made it better for me, because it was so different".