They were invited to perform in the Avandaro festival in 1971, but declined the invitation due to an already very busy schedule. In that year, they took part in the Jaime Humberto Hermosillo's debut film "" (""The True Calling of Magdalena""), starring singer and actress Angélica María, which more or less seriously addresses the topics that concerned young people of the era. In the movie, a (fictional) appearance of the band with Angelica Maria (in their alter egos) at the Avandaro festival can be seen. The movie editors combined in-studio shots with the actors and real ones of Avandaro, shot by Telesistema Mexicano. After this successful film came its soundtrack, "" considered the band's second album. The members of the band at its height were: Óscar Rojas (vocals), Marylú Bano (backing vocals), Pati McLean (backing vocals), Carlos Valle (lead & rhythm guitar), Francisco Martínez Ornelas (bass guitar), Antonio Cruz (drums and percussion) and Javier Martín del Campo (lead & rhythm guitar). With the hippie trend waning worldwide, the group's musical concepts varied between several trends and influences, so the search for new hits was fruitless, producing only the song "Pigs," among the last to achieve fame. Lack of interest of major record companies to support counterculture rock and as result of the phenomenon called "Avandarazo" (the repression of La Onda movement by the Mexican Government) successful Mexican rock bands were suddenly banned. Adding to this was the emotional turmoil that the band members began to experience, unleashing a series of fights and disagreements that eventually led to changes in the lineup. Lead singer Oscar Rojas grew weary of both Mexico city and the group environment, leaving the band permanently in late 1972 together with Bano and McLean. In 1973, the band released the E.P. "Congore tumbero a la mar" with moderate success. This marked the end of their relationship with Polydor and the end of an era for the band. Facing a somewhat hostile political and social reaction, the group's fortunes experienced a downturn. Changing musical trends ended by subduing psychedelic rock, and while some groups managed to survive on the fringes of mainstream media (the band Three Souls in my Mind for example, becoming popular in suburban areas and with the working classes only), the band members decided to radically change their musical style, becoming singers of romantic ballads, thus ending their time as a rock band.