Maestoso from Symphony no 3 “Organ” by Camille Saint Saens.
As it occurs to me:
I’ve spent a lot of time listening to Rachmaninoff’s recordings and feel very lucky to have them. Saint-Saens died over 100 years ago and to be frank, this is not bad at all in terms of quality. It includes bits of Concerto 2, Concerto 5 and the Africa Fantasy (I really should look for the piano music of that).
There is, incidentally, a recording of Brahms knocking around as well which was done in 1889. I find it almost impossible to listen to from a music point of view – the sound quality is very evidently early. You’ll find it on YouTube. I went looking for the Saint-Saens because someone mentioned he was a very good pianist in his day. The recordings date from 1904, just 15 years after the Brahms recordings and they are a significant jump in quality.