Demander was formed by Karen Kanan Corrêa and Sivan Harlap. The two joined seminal pop-punk darlings The Hissyfits as drummer and violist. Karen switched to bass and, over the next two years, while touring extensively and opening for acts like The Killers, Gary Go, Holly Golightly and many others, the two became fast friends and musical allies. The formidable rhythm section formed Demander in 2005 and guitarist Jared Scott came on board shortly thereafter. Jared's madman playing was a perfect complement to their exuberant rhythmic foundation and the trio recorded an EP (Demander), an album (The Unkindness of Ravens), and several singles.

The trio's unique sound and energy won them tours with the Hold Steady, Art Brut and the legendary English band New Model Army. In 2009 Demander started their second full-length album (Future Brite) with the masterful David Kurutz taking over guitar duties. The album features mixes by John Agnello (Dinosaur Jr., Sonic Youth) and tracks have been featured on MTV, IFC, and ad campaigns including Levi’s UK.

Demander went on hiatus in 2011 and Karen released two EPs under the name Futurebrite while also touring on bass with several national and international artists. Karen and Sivan re-formed Demander in 2017 under the moniker Bel Aviv and released an eponymous EP.