The band's two main members were Carles Sabater, singer, and Pep Sala, who played guitar and sometimes keyboard.

Pep Sala was the composer whilst lyrics were written together with Carles Sabater.

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").

Sau participated in the historic concert on Palau Sant Jordi on June 14, 1991, together with Els Pets, Sopa de Cabra and Sangtraït.