For biographical information on these singers, see Giuseppe de Luca on this site, or visit the excellent pages on Amelita Galli-Curci by John Craton. I don’t share his enthusiasm for the diva, but the pages do give a decent portrait of an important singer.
This is an electric recording (after 1925), and although I’m not thrilled with Galli-Curci on this disk, I think de Luca is outstanding. Compare this to the earlier acoustic recording of de Luca singing A tanto amor