I don't see it that way. I don't think Berio was a better composer than Vivaldi or Verdi because modern music in general is better than baroque music or romantic music. What we can say that some composers stick out because they are among the best of their time. And when Johann Sebastian Bach arguably is the greatest of the zillion good baroque composers, that is a strong argument he must be one of Germany's greatest composers ever. And Berio is definitely one of the most exciting composers of his generation.Jack Kelso wrote:
For instance, if one were to state (and has!) that Berio were "the greatest Italian composer" then it only follows that that person's choice for the greatest British composer might well be Humphrey Searle---and the greatest German composer Karl-Heinz Stockhausen or Hans-Werner Henze.
Likewise, if J. S. Bach were the greatest of all German composers, then Rameau must be tops in France, Purcell in England and Corelli or Vivaldi in Italy.
Honestly i don't know enough about Italian music to say without reservation that Berio is the greatest Italian composer ever, this is all about personal opinions. But just about everything i have heard of him is sensational: The sinfonia, the folk-songs, different sequenzas, his pieces for violin duo, Labyrinthus 2. Very different works too. So he is a strong contender.