Albert Alvarez 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.
Alvarez appears on the following tracks:
11. Gounod – Faust – Trio de duel
Albert Alvarez, tenor; Mathilde Bauermeister, contralto; Giuseppe Campanari, baritone; Edouard de Reszke, bass. Luigi Mancinelli, conductor