Looking for JB show date

[Martyd]

Hello, I'm looking for a specific Jack Benny radio show where Jack was taking a violin lesson and was tightening the strings on his violin. Mel Blanc told Jack to keep tightening the strings. By the sound-effects, you can tell that he was over tightening them when finally the strings broke. Any ideas? I'm thinking I heard reference to this in the series "Speaking of Radio, the Jack Benny Show" that Chuck Schaden released. I'm listening, but have not run across this scene, yet.

Any help would be appreciated! Thank you!
Marty