English indie rock quartet Alt-J (also known by the Greek letter delta (∆ - which you produce on a computer keyboard by holding down the "ALT" key and typing a J) released their debut album An Awesome Wave in Europe in May 2012, and won Britain's coveted Mercury Prize for their pains. Available in the United States since September 2012, the album has won Alt-J a devoted following for vocalist's Joe Newman's unusual lyrical style and the band's highly melodic guitar/keyboard combinations, reminiscent of what might have happened if Radiohead and Jeff Buckley had ever found themselves in the same recording studio. To get a sense, listen to singles like "Tessellate" and "Breezeblocks." 8 pm at 225 Decatur Street. (504) 310-4999 or houseofblues.com.