Sgambati: Mélodie de Gluck, played by Rachmaninoff 

This is one of my favorite piano recordings, I find this to be one of the most beautiful pieces of music. Rachmanninoff does an extraordinary job voicing, phrasing and playing with such a nice rubato. This piece is undoubtedly the most famous thing Sgambati ever wrote, it is an arrangement of a melody from Glucks from Orfeo ed Euridice.
Recorded May 14, 1925
There is also a reconstruction of a piano roll recording which is very nice: • Gluck-Sgambati: Melodi...