B.o.B sticks to slinging bars on “Boom Bap,” a collaboration with T.I. and Mos Def off his new mixtape EPIC. “To live my life, you’d have to try to hit the lottery twice/ Find it amusing, I’m giggling at what you made in a year/ Quadruple that while in prison serving my day and a year,” boasts Tip over the drum-patterned beat, while Mos and Bobby Ray keep it real with their rhymes.