"Violin Lesson", the December 5th, 1948 episode of "The Jack Benny Program" (the fourth-to-last show he did for NBC Radio), will be rebroadcast, split into two parts, the weekend of December 10th-11th on "When Radio Was".
The first part of the show will be heard on the 10th; the second half of the show will be heard on the 11th.
The show is heard on numerous radio stations throughout the United States; however, the station where most people in the Eastern half of the U.S. and Canada would be most likely to hear the show (Chicago's 50,000-watt WBBM), to my knowledge, only airs "When Radio Was" on weeknights.
You can go to http://www.whenradiowas.com , and on the radio show page, access a state-by-state list of stations that air the show.