Since someone already mentioned Breakfast Machine from Pee Wee’s Big Adventure, I’ll go with Now You’re a Man by DVDA, from Orgazmo.
An M-A-N MAN!
I love the score to Hal Hartley’s Amateur, by Jeffrey Taylor and Ned Rifle.
That wasn’t Flatt and Scruggs. It was Eric Weissburg and Steve Mandell.
Also, it turns out it wasn’t an original piece of music, but a rip-off:
And now you know…the rest of the story.
Main theme from “Ragtime” (1981) I think the vocal version is “One More Hour”. Here’s Amazon’s samples from the soundtrack: