For the Chase and Sandborn Hour, Edgar Bergen was actually just doing multiple voices (being a radio ventriloquist was just a humorous hook). You can hear some

For the Chase and Sandborn Hour, Edgar Bergen was actually just doing multiple voices (being a radio ventriloquist was just a humorous hook). You can hear some episodes here: https://archive.org/details/BerganMccarthy https://archive.org/details/BerganMccarthy Mel Blanc (of Looney Tunes voice acting fame) did much the same thing for the Jack Benny radio shows and also had his own half-hour long radio show, which you can hear here: https://archive.org/details/OTRR_Mel_Blanc_Singles https://archive.org/details/OTRR_Mel_Blanc_Singles