It's a match made in battle-rap heaven! On this single from Minaj's upcoming debut, two motormouths – both of whom know their way around a punch line, love goofy voices and suffer from severe cases of multiple personality disorder — team up for nearly five minutes of back-and-forth word-hurling. They rhyme like they're playing hot potato with a live grenade, and Swizz Beatz's hushed, chugging production throws the microphone viciousness into jarring relief. The common theme is anger toward female haters: Minaj tears into a "has-been" femcee who needs to "hang it up" (presumably Lil' Kim, with whom she's been beefing for months). Eminem, meanwhile, rails against a woman who may be a metaphor for life itself. It's hard to say exactly why he's so mad at her — but he threatens to pee on her. Twice.

“Help Me”

Joni Mitchell wrote and recorded this song for her album Court and Spark, but she had to switch from her regular band to make the song sound exactly the way she wanted. "I had attempted to play my music with rock & roll players," she told Rolling Stone. "They’d laugh, 'Awww, isn't that cute? She's trying to teach us how to play.'" Mitchell switched to a jazz band, Tom Scott’s L.A. Express, and scored the biggest hit of her career in the process.