Alt-J is an English indie rock band formed by Joe Newman (guitar, vocals), Thom Sonny Green(drums), Gus Unger-Hamilton (keyboards, vocals) and Gwil Sainsbury (guitar, bass). Their sound gravitates between experimental rock, Indie eletcronica, folk electronica, indie rock, indie pop, and art rock, The British trio returns to Poland, with their greatest hits: "Breezeblocks", "Left Hand Free", and material from the album "Reduxer". which is their hip-hop reinterpretation of tracks from the band's third album, "Relaxer".