Mario Ancona (1860 - 1931)& Enrico Caruso (born Errico Caruso; February 25, 1873 August 2, 1921) sing this duet from Bizet's opera "The Pearl Fishers", in Italian. I think this is the most beautiful recording of the duet ever made. Their voices blend perfectly. Notice how the vibrato action of each singer also matches. When two great singers sing together that always happens. Many times today the singers' vibratos clash when singing duets.