Gee, don’t they have an inventory of their holdings?

In January the Library of Congress made a momentous musical find: a tape of the Thelonious Monk quartet with John Coltrane at Carnegie Hall on Nov. 29, 1957, a rarity by a little-recorded and short-lived band that had major historical significance. That tape – containing nearly an hour of music – will be released by Blue Note on Sept. 27, under the title “Thelonious Monk With John Coltrane: Live at Carnegie Hall,” the record label announced.

Arts, Briefly – New York Times

Thanks to Jen for the pointer.