Fatras is a French progressive rock band formed in 1973. They are known for their complex and intricate compositions, which often feature odd time signatures and extended instrumental passages. The band's sound has been described as a mix of jazz, classical, and rock, and they have been compared to bands such as King Crimson, Yes, and Gentle Giant. Fatras has released a number of albums over the years, including "G.A.S.T.O.N (Intégrale)", "Virevoltige", and "Vie de grenier".