This boxed set represents incredible value including, as it does, some of the greatest recorded performances of many of the standard arias, choruses and orchestral interludes. There are many tracks of jussi Bjorling and Maria Callas including some performances that have never been matched. Jussi Bjorling in Nessun Dorma,the Flower Song, O Paradiso and the famous performance of the duet from the Pearl Fishers with Robert Merrill. Maria Callas in Casta Diva, Vissi D'Arte. And there are tracks with Kirsten Flagstad, Renato Tebaldi, Elizabeth Schwartzkopf, Tito Gobbi, Luigi Alva Guiseppe Di Stefano, Mario del Monaco and even a few to remind us just how good Mario Lanza could be. The quality of the recordings is variable since some are quite old; some are excellent and none is unacceptable. If you want to get to know more about Opera you cannot do better than buy this box.