I am very excited about the news and hope to visit as soon as it is ready, hopefully I can do so on a weekend.
Sheet music will probably only be viewable onsite.
There is also material at the Library of Congress which I made them bring in from copyright 30 years ago. I had sent Wayne copies of all of it, I wonder if what I sent him will wind up at NYPL! I am very curious about a number of unknown pieces, including Mass '65. One piece that was not at LC was his very first composition, La Vie Et La Mort, intended for two organs but eventually played on solo piano. I hope NYPL will have it.
I attended the lecture where this blog post was presented. The presenter did not address where the material came from, but I suspect he thought the Library had somehow acquired it.
Jazz Scholar Willard Jenkins Reflects on the Library’s Jazz Collections | In The Muse