Like their band name, the multi-faceted sound of British indie rockers Alt-J (∆) requires a bit of explaining. The name derives from the combination of keys that results in a delta sign (∆) on Mac computers; the sound – a combination of folk-pop, skittering polyrhythms, and soaring falsetto harmonies – results in happy critics and even happier listeners. The quartet formed in 2007 in a Leeds Metropolitan University dorm room, and the constraints of recording demos in a quiet study environment heavily influenced their hushed, intricate approach to indie rock. Their 2012 debut An Awesome Wave received the Mercury Prize, Britain’s most prestigious music award, and launched the band to indie stardom with singles “Breezeblocks” and “Fitzpleasure.” Alt-J are on tour in 2013, and ticket buyers can be sure that no matter how big the venue, the band will deliver the intimate live concert they’ve become known for.