Millennium contains several of Os Mutantes' best songs, such as "Ando Meio Desligado," "Panis et Circenses," "Baby," "Algo Mais," "Desculpe Babe," "Dois Mil e Um," and "O meu Refrigeirador não Funciona," which are all brilliant in their own ways. The big advantage with this album in comparison with the Everything Is Possible compilation is that this one contains the full-length album version of "Ando Meio Desligado," while a shorter and inferior version is used on Everything Is Possible. On the other hand, Millennium strangely enough contains a couple of songs that represent the least impressive moments of Mutantes' career, most notably the tedious "'A' e o 'Z,'" which was recorded long after Rita Lee had left the group. This is slightly irritating because these weaker songs are present at the expense of so many great songs that were left out. But to be fair, it would be wrong to make too much of a fuss over this as the only really weak track is the already mentioned "'A' e o 'Z,'" and the rest of the songs vary between good and great. There is plenty of material on this compilation that really gives the listener a picture of the enormous creative talent of Os Mutantes. Thus, Millennium could easily work as a good introduction to the group's catalog.
AllMusic Review by Philip Jandovský