39. Os Mutantes, 'Os Mutantes'
Os Mutantes were kids when they made this debut: Sergio Dias Baptista was only 17, his brother Arnaldo was 20 and singer Rita Lee just 21. But their irreverent blend of Brazilian pop and Anglo-American rock (like that of their cohorts Gilberto Gil and Caetano Veloso) made for a wild, idea-packed ride where the tunes ("Panis et Circencis," "Baby") come as fast as the sonic surprises. It's one of the late-Sixties' most mischievous head trips, which is saying something.