Adagio for Strings: Leonard Slatkin, BBC orchestra, September 15, 2001, perhaps its longest and most emotional performance ever.

https://www.youtube.com/watch?v=Y4PWdOoOQjI

The Saddest Music Ever Written: The Story of Samuel Barber's "Adagio for Strings," Pegasus Books. Hardcover, September 2010, paperback, March 2012.

***

"Adagio fro Strings" Presentation: Warwick's Bookstore, La Jolla, CA November 30, 2010

***

Audible.com: The Saddest Music Ever Written, narrated by Gregory St. John.