IMSLP Forums

Can someone confirm definitively that this piece is PD-US? The page is marked as such, but the manuscript is undated and I'm reading articles suggesting that she wrote the piece in 1943, which would mean it's almost certainly not public domain in the States unless, I suppose, the manuscript itself is public domain through lack of renewal. I'm admittedly a bit foggy on how that works when the piece wasn't officially published until much later and as such may never have been officially registered with the Library of Congress.