Armando Seppilli was a conductor at the Metropolitan Opera, and can be heard in 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.
Seppilli can be heard on the following track:
10. Gounod – Faust – Air des bijoux
Emma Calvé, soprano. Armando Seppilli, conductor