Most underrated composer of 20th Century?


My choice is Bohuslav Martinu .
schubert
More than one here, so can't be "most" but perhaps, "very"?...
Edgar Varese
George Crumb

While I do not have first hand experience of their work, from doing a little reading on "minimalism" as it pertains to music, these two names deserve consideration:
La Monte Young
Henning Christiansen
If by "underrated" we simply mean deserving more acclaim than we think has been afforded so far, I would say Prokofiev. But maybe I'm just "out of the loop."
Conlon Nancarro! Works for player piano! I have a multi - CD set of these! Not one person in a million remembers him!