In 1971, bassist Arnolpho Lima Filho ("Liminha") and drummer Ronaldo Leme ("Dinho") officially joined the band. They released five albums together before Lee departed in 1972 to start a solo career. Rita Lee's 1972 album Hoje É o Primeiro Dia do Resto da Sua Vida was actually recorded with Os Mutantes but credited to Rita Lee due to record company disagreements. Subsequently, the band moved in a progressive rock direction with the album O A e o Z, recorded in 1973 but released only in 1992 due to disagreement with the record company. Arnaldo left the band in that year to pursue a solo career due to differences with other band members and problems with the abuse of LSD, followed by Dinho and, a year later, Liminha. Arnaldo subsequently was institutionalized and jumped from the building's window, causing a six-week coma. Sérgio Dias, the only remaining original member, led the band until its dissolution in 1978. During this time, they released one more studio album, a live album and an EP. Two unreleased albums were released many years later, the aforementioned O A e o Z and Tecnicolor recorded in 1970 and released in 2000.
