SXSW 2013 has gotten underway in Austin, Texas, and one of the opening musical performances of the festival came from Houston's Bun B. With super-producer Just Blaze manning the ones and twos, Bun performed "Big Pimpin" the collaboration his group UGK had with Jay-Z. During the performance, Bun not only rocked his own verse but also that of his partner, the late Pimp C, with the crowd joining in, reciting every word.

[via Rap Radar]