Aristide Masiero can be heard on a number of Mapleson Cylinders
(These are zip files – left click the link, download the files, then unzip when downloaded)
As the LP notes, this is not high-fidelity sound. This is IRCC LP7006, issued in 1955, containing transfers of a number of Mapleson Cylinders, recorded live from the stage of the Metropolitan Opera House from 1901 to 1903.
Masiero appears on the following tracks:
13. Verdi – La Traviata – Un dì felice, eterea
Dame Nellie Melba, soprano; Andreas Dippel, tenor; Aristide Masiero, tenor. Philippe Flon, conductor