O A e o Z

O A e o Z (also known as A e o Z, or "A" e o "Z", Portuguese: The A and the Z) is an album by Brazilian rock band Os Mutantes. It was their first record without founding member Rita Lee, and marked a shift in their sound to progressive rock. Recorded in 1973, but shelved until 1992, this was Arnaldo Baptista's last studio record with the group.

Personnel

 * Os Mutantes
 * Arnaldo Baptista – Hammond organ L100, Mellotron M400, Hohner clavinet C, cello, lead and backing vocals
 * Sérgio Dias – electric (Régulus II and Fender Stratocaster) and 12-string acoustic guitars, sitar, lead and backing vocals
 * Liminha – bass guitar (Regulus and Rickenbacker 4001), acoustic guitar, backing vocals
 * Dinho Leme – drums, tabla, backing vocals