Bipolar was the third album of El Cuarteto de Nos produced by Juan Campodónico. The album was recorded between September and November of 2008 in Montevideo. The follow-up to Raro features several guest appearances by Santullo, Martin Ferres and Luciano Supervielle.

Apart from Cuarteto De Nos' usual classic rock format, the album features string arrangements, a brass section and programming which widen the sonic palette of this new release.