Os Mutantes - Live at Teatro De Arena De Ribeirao Preto 8 August 1978 2xLP
Sérgio Dias, the only remaining original member, led Os Mutantes 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. Here's a brilliant performance of the band just before they disbanded embracing a more solid prog-rock vibe.