About Alexis Weissenberg
Alexis Sigismund Weissenberg (Bulgarian: Алексис Сигизмунд Вайсенберг; 26 July 1929 – 8 January 2012) was a Bulgarian-born French pianist. When Karajan watched the movie, he immediately invited Weissenberg to participate in a filmed performance of the Tchaikovsky First Concerto, replacing Sviatoslav Richter. His 1965 film recording of Stravinsky's Three Movements from Petrushka (directed by Åke Falck) was also highly praised. Born into a Jewish family in Sofia, Weissenberg took piano lessons at three from Pancho Vladigerov, a Bulgarian composer.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.