Most underrated composer of 20th Century?

I think Stravinsky's "L'Histoire du Soldat" is absolutely brilliant. Only a first-rate composer could produce such a work IMO.

Learsfool: I'm curious whether you include John Adams as a minimalist. I completely agree with you about Glass, but think Adams is terrific, and prefer his music to Reich's. Nixon in China is in particular a masterpiece. Nixon the man will be known centuries from now more as the title character from the opera than as a historical crook statesman. Assuming, that is, that culture survives that long, of which I am not optimistic.

And Stravinsky is definitely not overrated. Nor is Schubert the composer. But Schubert the OP?

++ Bartok. Stravinsky too. Why compare? Each gets their fair share of love.

Well Map, IMHO because there is only so many hours we have on this earth to listen and the good is the enemy of the best.
But then I'm senile.