We've talked about Bub (Bill Frawley) singing before. If you want to hear a couple samples of Bill Frawley's album there is a free podcast featuring neat music and also the Great Gildersleeve in every episode. On 2 of those episodes you can hear a selection from Bill Frawley's album. On Episode 16 and Episode 34 that's where you'll hear Bub singing!:D Here's the podcast:

https://www.podomatic.com/podcasts/soundslikeradio