In 1979, Sérgio Castro and Álvaro Azevedo founded the band called Trabalhadores do Comércio. The group's main characteristics were the fact that they sang in "nortense" (Portuguese with a northern accent) and the humour in their lyrics. Their debut album, released in 1980, was the single "Lima 5". In 1981, their first album, "Trips à Moda do Pôrto", was released, containing the band's best-known song: "Chamem a Polícia". The second LP, "Nabraza", was promoted throughout the country. In 1986, the Trabalhadores do Comércio competed in the RTP Song Festival with the song "Os Tigres de Bengala S.F.R.", which came first ex-aequo and was rele