His radio performances of operas performed in concert, all eventually made available on LP and CD, include
Ludwig van Beethoven's "Fidelio",
Giacomo Puccini's "La Boheme" (the only instance of a recorded Puccini opera conducted by its *original* conductor 50 years after its world premiere) and
Giuseppe Verdi's "La Traviata", "Otello", "Aida", "Falstaff", and "Un Ballo en Maschera". The performances of "La Boheme" as well as the Verdi operas are considered among the finest ever done.