I only learned about it today (August 7th), but Toronto's CFZM, according to the station's website, is rebroadcasting classic Jack Benny Radio shows this week (August 6th-9th) and next (August 13th-16th).
On each of those evenings, the show will air at 10:30 P.M. Eastern Daylight Time.
CFZM is a powerful 50,000-watt signal that art night can be heard across the Eastern United States and Eastern and Central Canada.
Outside of these areas, you can go to http://www.am740.ca or http://www.zoomerradio.ca at 10:30 P.M. EDT, click-on the "Listen Live" link, and enjoy the show!
(I don't work for CFZM nor know anyone who does)