Michal Hambourg, the living link to pianism's Golden Age, in an unpublished performance of Chopin's Etude in A-flat, Op. 25, no. 1. (mp3, 2'54", 1.3MB)
You can save it to your hard drive by clicking and holding on the file link (below) and choosing the "download file (or link) to disc" otion from the popup menu.
Download: hambourgchopin.mp3