It’s not easy to make a great song, but any self-respecting rapper has to be able to spit a hot 16. Nowadays when a rapper puts out a project the first question everyone wants to ask is, “Who’s featured on it?” Guest verses are a huge part of hip-hop: A great feature can start a career, resurrect one, and prove which rapper is really the hottest in the game (which inevitably leads to debates about who got murdered on their own shit). So after running through the Best Albums, Best Songs, and Best Rap Lines of 2012 to date, we felt it was only right for us to count down the 20 Best Guest Verses of 2012 (So Far). Our list includes veterans who found the fountain of youth, young artists who found a way to establish themselves, and one guy who's just giving away hits this year.

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