 Osborn sang in all but one of Decca's eleven D'Oyly Carte recordings made between 1949 and 1955.His recorded roles were the Defendant in "Trial by Jury" (1949), Ralph Rackstraw in "H.M.S.Pinafore" (1949), Frederic in "The Pirates of Penzance" 1950), Nanki-Poo in "The Mikado" (1950), Marco in "The Gondoliers" (1950), Richard Dauntless in "Ruddigore" (1950), Fairfax in "The Yeomen of the Guard" (1950), Tolloller in "Iolanthe" (1952), the Duke in "Patience" (role sung briefly by Osborn and taken over by Neville Griffiths) (1952), and Cyril in "Princess Ida" (1955).