Eminem has refused to let comedy singer Weird Al Yankovic shoot a video for his new song, Couch Potato, a parody of the rapper's Lose Yourself.
Yankovic said: "It's very disappointing. This could have been my best video ever."
But a spokesman for Eminem said Lose Yourself was "an important personal piece of music for him, a piece of art".
Artists including Michael Jackson have allowed Yankovic to tackle their videos in their past. "