 In the heyday of the Hollywood studio system (c. 1920s-1950s), film composers often retained their manuscripts and recordings of their music given to them by the studios as a courtesy.When scoring independent films composers often retained all the score materials themselves, but not the actual "music track" or soundtrack, which was kept by the production company.In 1937, producer and film industry visionary David O. Selznick proposed that copies of selected scores should be deposited at the Museum of Modern Art in New York City, though the plan did not materialize.