Okay, if you’re online right now, pull up the YouTube video of “Hangover (BaBaBa).” It came out about five months ago, and it’s all fire and headsnap. This is Buraka Som Sistema, a four-man crew from Portugal that rages a sound called progressive kuduro. If you had not heard of kuduro before Buraka Som Sistema, you are not alone. It’s a dance music that arose in the clubs of Angola back in the 1980s, and it has exploded in Lisbon over the past decade. Kuduro producers use percussion samples from southwestern Africa, bring in live drums, soca beats, and deep tribal house, and then speed it all up, pushing the BPM into the 130-145 range. Kuduro translates in Portuguese to “hard ass,” and while it is all over the Lisbon club scene, the four gents who comprise BSS (DJ Riot, Conductor, Kalaf and LilJohn) have mixed the African kuduro sound with techno and taken it global, collaborating with people like M.I.A., Pongolove and Puto Prata along the way. Ultra energy ragga punk thrash! KEVIN SEAL