If you're like me, your boss is a tall German guy who likes to claim he invented the word "trill." We finally get to set the record straight this Sunday in the presence of Bun B, the term's symbolic progenitor and coolest living embodiment. Half of the inestimable Texas duo UGK (along with the late Pimp C), Bun is basically the best of Southern rap incarnate, all booming voice and laid-back rhythmic dexterity and authoritative hood wisdom; at 41, he's busy as ever riding the guest-verse circuit, lecturing at Rice University, and, um, co-publishing that rap coloring book. Opening is fellow Texan Kirko Bangz (go ahead, say it out loud), a lightly auto-tuned strip-club enthusiast who's not as silly as Andrew W.K. but easier to like than Drake. He's featured on a song from Bun's most recent album, December's Trill OG: The Epilogue, called "Triller." See you there.