As a hybrid genre in its origins, rap music has always lent itself to collaborations that step outside the conventions of the form. It's been common practice for a long time to include a verse by a popular rapper on a non-rap song—it's a little bit like when Quentin Tarantino "presents" a film, except that rappers actually contribute to the work their name is on and they probably have better taste than Quentin Tarantino does. This isn't a fool-proof formula, though, and the results range from good to interesting to absolutely terrible. Here are a few of the more bizarre gems the rap gods have blessed us with.
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