With its arty, eclectic, genre-hopping debut album, An Awesome Wave, Alt-J was a shoo-in to win the Mercury Prize in November. At least, according to the U.K. betting shops, although it's unclear whether the 4-to-5 odds were set based on judgments of the album's quality or from insights into the awards panel's proclivities in selecting the best British or Irish album of the year. Alt-J, which formed at Leeds University, took its name from the Mac command for a delta, signifying change, and its songs tend to evolve, melding styles and shifting shapes. Radiohead-derived guitar rock, choral vocals with frequent a cappella interludes, occasional dubstep beats, some folky fingerpicking: An Awesome Wave is a compendium of alt- and indie-styles overlaid with prog-rock high-mindedness. On a post-Mercury victory lap, the quartet headlines the TLA on Thursday.