Alt-J (sometimes stylised ∆) was formed when Gwil Sainsbury (guitar, bass), Joe Newman (guitar, vocals), Gus Unger-Hamilton (keyboards), and Thom Sonny Green (drums) met at the University of Leeds, Leeds, UK in 2007. The band currently resides in Cambridge.
These are videos from concerts where alt-J played, so they may be of other bands that played the concert as well.
T In The Park 2015 Jul 10 - 12, 2015 Strathallan Added by Michael Quantrill
T in the Park Jul 10 - 12, 2015 Added by Barbara Brock Baisden
KROQ Almost Acoustic Christmas Dec 13 - 14, 2014 Inglewood, California, United States Added by Bruhvvmetal
Interview
alt-J Oct 16, 2014 Portland, Oregon, United States Added by Chris V.
