alt-J is a British band formed in 2007, known for their unique blend of indie rock, electronic, and folk music. The group consists of members Joe Newman, Gus Unger-Hamilton, and Thom Green. They gained popularity with their debut album, An Awesome Wave, released in 2012, which won the Mercury Prize. The band's sound is characterized by intricate harmonies, unconventional song structures, and the use of various instruments. Their music often features abstract lyrics and a distinctive vocal style. Over the years, alt-J has released several albums, including This Is All Yours and Relaxer, further establishing their presence in the music industry.