I understand the Krauts had a composer way back with a Johann Sebastian in it.

4 seconds sound clip from the Stalag 17 movie soundboard.

You can hear this line at 00:10:17.475 in the Blu-ray version of the movie.

Quote context

[...]

- Hold it, Sefton. I said, hold it!

- So we heard some shots. So who says they didn't get away?

- Anybody here wanna double their bet?

- Every morning at 6 on the dot they'd have the appell. That's roll call to you.

- Every barracks had its own alarm clock. Our alarm clock was Feldwebel Schulz. Johann Sebastian Schulz.

- I understand the Krauts had a composer way back with a Johann Sebastian in it.

- But I can tell you one thing: Schulz was no composer. He was a schweinehund. Was he ever a lousy schweinehund.

- Gentlemen, you must get out for roll call.

- Your blower's busted.

- Ja, good morning to you.

- Oh, blow it out your barracks there, Schulz.

- Aufstehen, everybody. Come out. Get down.

- Okay, come on, you sack rats. Cut the beefing and get up.

[...]