"Cellist, Violinist, Pianist - The Trio (1953) - Extremely Rare Film Landmark musical performances were a staple of early television, but unfortunately many of the early examples have been destroyed. This extremely rare film documents cellist Gregor Piatigorsky, violinist Jascha Heifetz, and pianist Artur Rubenstein. Somewhat stilted in the way only early television can be, it nevertheless showcases the technique and personalities of three of the 20th century's greatest musicians."
"Grisha" Piatigorsky is one of my students' cellistic great grandfathers. :-)