I did check the father's/brother's cache. Found listing -sheet music - for Manfred (was not actually at the location in library)... You've piqued my curiousity however. Google seems to be at same loss. Interesting side note found here: [link|http://www.leonardbernstein.com/studio/element2.asp?FeatID=2&AssetID=20|http://www.leonardbe...atID=2&AssetID=20] as he felt it was a major enough piece to use in his debut.
Damn, another thing I must do... so little time. Ad hoc, ad lock and quid pro quo\ufffdso little time, so much to know!