5. Chance the Rapper, 'Acid Rap'
The second mixtape from this 20-year-old Chicago MC is the ultimate in psychedelic hip-hop. Chance spins Lil Wayne-meets-Hendrix language swirls punctuated by the real-life observations of a kid who grew up in a world where "it's dark a lot . . . easier to find a gun than it is to find a fucking parking spot."