alt-J is an English rock band formed in 2007 in Leeds. Known for their unique sound that blends indie rock with folk and electronic elements, they gained significant attention with their debut album, 'An Awesome Wave,' which won the 2012 Mercury Prize. Their single 'Breezeblocks' became a breakout hit, showcasing their innovative songwriting and distinctive vocal harmonies. The band's name, alt-J, is derived from the keyboard shortcut for the delta symbol, reflecting their artistic approach. With subsequent albums like 'This Is All Yours' and 'Relaxer,' alt-J has continued to evolve their sound while maintaining a loyal fanbase.