Most underrated composer of 20th Century?


My choice is Bohuslav Martinu .
schubert
Harry Partch, who not only was a prolific composer but also developed his own instruments and microtonal scales should also be included in any list of the "underappreciateds".
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!