Phil Harris and Dennis Day rode the popularity of Jack Benny on their own programs on NBC. In fact, for the first two years of its run, Harris' show immediately followed Benny's.
Charlie McCarthy and Edgar Bergen made their radio debut on NBC's The Chase and Sanborn Hour (sponsored by a noted coffee brand) in 1937, supported by singer Nelson Eddy (a role later filled by Dale Evans, amongst others). After a famous feud with W. C. Fields in the 1930s (during which Charlie often vowed to the comedian that he'd "mow him down"), the dummy became a true icon.
Quiet Please 48-03-29 043 Quiet, Please
OMFxxxxxx - Book 79 Chapter 15 [441]
COTY 49-03-04 The Music Hall Murder
1941 1211 March of Time - Pearl Harbor
Sherlock Holmes 451112 The Speckled Band