Rehearsal for the 12/13/1951 performance marking the 5000th concert of the New York Philharmonic. According to the New York Times, this rehearsal (which ran from 2:30 to 4:00 PM) was broadcast on WNYC. "Television Union Endorses Merger." New York Times (1923-Current file): 52. Dec 12 1951. ProQuest. Web. 23 Jan. 2014.