Luigi Mancinelli was a conductor at the Metropolitan Opera, and can be heard in a number of Mapleson Cylinders.

Mediafire link for 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.

Mancinelli can be heard on the following tracks:

2. Verdi – La Traviata – Sempre libera
Marcella Sembrich, soprano; Carlo Dani, tenor. Luigi Mancinelli, conductor
27/2/1903

11. Gounod – Faust – Trio de duel
Albert Alvarez, tenor; Mathilde Bauermeister, contralto; Giuseppe Campanari, baritone; Edouard de Reszke, bass. Luigi Mancinelli, conductor
18/2/1903

12. Gounod – Faust – Final trio
Dame Nellie Melba, soprano; Albert Saléza, tenor; Edouard de Reszke, bass. Luigi Mancinelli, conductor
4/3/1901