Sonos is a professional vocal group based in Los Angeles. Sonos grew out of a 2006 recording project and began performing and touring in 2008. The group's repertoire centers around innovative covers sung a capella, except with the use of effects pedals. Sonos is currently recording a third album of original material, produced by member Chris Harrison. Sonos competed in the third season of the The Sing-Off, and was eliminated on the fourth episode.