Sau was a music group from Catalonia, which rose to fame in the area in the 1990s, being among the first groups to write pop music with Catalan lyrics, known as rock català. The band's two main members were Carles Sabater, singer, and Pep Sala, who played guitar and sometimes keyboard. Sabater's death following a concert in 1999 ended the band's existence. Two years later, the album What a night, recorded in London and Barcelona, confirmed the status of the group. That disc included Sau's most recognisable singles, "Boig per tu" ("Crazy for You") and "El Tren de Mitjanit" ("Midnight Train").