 The 1938 broadcast performance of Verdi's Othello was sampled with the permission of the Metropolitan Opera. All the other Tibbett recordings we sampled can be found within a 10-CD box set, including a 60-page essay by Conrad L. Osborne. It features an unprecedented array of Tibbett recordings and broadcasts, all newly remastered by Ward Marston. It's available via the web from Marston Records. Joe Horowitz's book on Porgy and Bess is on my way.