Conversation so far:
Did Dimitri Tiomkin make his first film for Capra?
Yes, Dimitri Tiomkin received his first break from Columbia director Frank Capra.
What was the name of Dimitri Tiomkin's first film?
Dimitri Tiomkin's forst film was Lost Horizon
Did Dimitri Tiomkin do any other films during 1937 to 1946 besides Lost Horizon?
Yes, Dimitri Tiomkin worked with Frank Capra on films from 1937 to 1946.
where there any other films Dimitri Tiomkin did besides Lost Horizon?
Dimitri Tiomkin worked on You Can't Take It With You (1938), Mr. Smith Goes to Washington (1939), Meet John Doe (1941), and It's a Wonderful Life (1946).

Question: When did he quit working for Capra?
Self-contained rewrite: When did Dimitri Tiomkin quit working for Capra?