Check out T.I., B.o.B and Ludacris performing "On Top of the World" in Philadephia at the Wachovia Center for Power 99's "Powerhouse"! Concert was crazy...performances by Jay-Z, T-Pain, T.I., Ludacris, B.o.B, Keyshia Cole and Neyo. Check out more B.o.B videos at www.myspace.com/bobatl
