As a result, they were invited to write the soundtrack for a film called "Bete Balanço" in 1984, spreading their fame across the country. This same year they released their third album: "Maior Abandonado", which includes the song "Bete Balanço". This album sold more than 100 thousand copies in only 6 months. In January 1985, Barão Vermelho played at Rock In Rio. Cazuza had already expressed his desire to pursue a solo career, and had Frejat's support as long as he didn't leave the band. However, after some fights, Cazuza left the band for good, taking with him a few songs for his first solo album. Frejat took over as singer and in 1986 the band released their fourth album, "Declare Guerra." Though famous artists like Renato Russo and Arnaldo Antunes helped compose the album, it didn't receive much promotion. In 1987 they released their 5th album, "Rock'n Geral". The album received good reviews, but sold poorly, selling less than 15 thousand copies. This same year Mauricio left the band and Peninha entered as a percussionist and Magalhães as guitarist. Barros would return as a guest musician in many Barão albums. In 1988 the band released their next album, "Carnaval", which mixed hard rock with romantic lyrics. The album was a huge success on the radio, guaranteeing Barão Vermelho the opportunity to open for Rod Stewart in Brazil. The following year, with their popularity high, they released their seventh album, "Barão ao Vivo" (Barão Live), and this same year Som Livre released the collection, "Os melhores momentos de Cazuza e o Barão Vermelho" (The best moments of Cazuza and Barão Vermelho). The album included rare and previously unreleased tracks such as "Eclipse Oculto" and "Eu queria ter uma bomba". In 1990 bassist, Dé, left the band after continuous fights, and Dadi entered in his place. This same year, Barão recorded and released "Na Calada da Noite", showing their acoustic side. This album included the song "O Poeta está Vivo"- an allusion to Cazuza who would pass away a few months later from AIDS. In 1991 the band was chosen by the public and critics of Bizz magazine as the best band of the year, and recorded an MTV Unplugged.