For this lunch break, I chose Arthur Rubinstein playing Saint-Saëns' Piano Concerto No. 2 in G minor, Op. 22. This video is from 1975, when he was 88 years old, and while almost blind, this might have been one of his best performances.
As a side note, he played this Concerto since 1904, when it was in front of Saint-Saëns.
I added the YouTube link for the longer version.