Paul Wittgenstein plays Ravel's Piano Concerto for the Left Hand in D Major

A budding concert pianist when he lost his right arm to a Russian bullet in World War I (it was amputated in a Russian prison hospital in 1914), Wittgenstein commissioned the work from Maurice Ravel.

From the YouTube caption: "Wittgenstein also performed the premiere with Robert Heger and the Vienna Symphony Orchestra on January 5, 1932."

"This (very short) excerpt from the cadenza, recorded in Paris [in] 1933, shows some of Wittgenstein's piano technique."

Anthony Gottlieb's April 6, 2009 New Yorker article about the remarkable Wittgenstein family pulled me in and wouldn't let go.