that in 1931 the Campbell Soup Company began radio advertising? It would sponsor radio programs like the George Burns and Gracie Allen Show and the Campbell Playhouse. This is where the famous slogan "M'm M'm Good" was first aired.
Click on the following link to see the history of Campbell's, hear a commercial, listen to an old radio program, etc.: http://www.digitaldeliftp.com/LookAround/advertspot_campbells.htm
or you can click on this link to listen to some of the Campbell Playhouse old time radio shows: http://www.radiolovers.com/pages/campbellplayhouse.htm