Television and radio shows are added to the collection after archival discoveries and through donations from individuals and organizations. In 2002, the Museum held a showing of the previously unseen rehearsal film of Rodgers and Hammerstein's "Cinderella" telecast from March 17, 1957. This rehearsal was found in the CBS vault while the Museum was on a quest for other "lost" "Cinderella" materials. It had been believed that on the night of the live broadcast the show was preserved on both kinescope and videotape and then transmitted to the West Coast. Seeking either of these, Jane Klain, the Director of Research at the New York facility, asked CBS to search their vaults. The CBS database listed three 16mm films featuring five-minute segments of Julie Andrews performing in the show. When the earliest one was brought from the CBS vault, it was discovered to be the full dress rehearsal.