I didn't know this was Sousa. I mean, I'm not surprised.

From its Wikipedia article:

Python member Terry Gilliam, its only American, decided to use the theme. He has said the piece was chosen because the troupe thought it could not be associated with the program's content

And here's something that uses it too. From last summer:

I may have just done something a bit unwise.

I just authorized a charge of $508.50 to a dodgy internet travel agency for a consolidator ticket they may or may not be able to buy on my behalf.

( Here's the story. )

I guess I'll see what happens.