Singer/songwriter from Argentina Miguel Mateos started getting involved in the local music scene by leading a band called Cristal. Along with his brother Alejandro Mateos and musician Jorge Infusino, the talented artist formed a band called Zas in 1979. The group was presented live while opening for British rock act Queen in February of 1981. A self-titled debut album was released in 1982, followed by Huevos in 1983. By that time, bassist Raúl Chevalier and guitarist Eduardo Sanz joined the band. After issuing Tengo Que Parar in 1984, Miguel Mateos y Zas hit local charts with a song called "Tira Para Arriba." Soon after, a live recording was made at Argentinian Coliseo Theater, later released as Rockas Vivas. The success of that record allowed Miguel Mateos to perform four acclaimed shows at Buenos Aires' Luna Park, one of the most important local venues. The following year, the group moved to the U.S., this time with guitarist Carlos García and bass player Cachorro López. The result of that reunion was Solos En America, a Latin rock marterpiece. During the 1990s, Miguel Mateos settled down in Miami, where the artist made four solo records. In 1998, keyboardist Mario Maselli and bassist Ariel Pozzo joined the new band's lineup, recording Bar Imperio.