Can you take the theme music from a TV show and change the lyrics?

Here is an old show.

Here are the new lyrics I learned from the boys in school.

Stranded, stranded on the toilet bowl,

what can you do when you're stranded

and you can't find a roll?

To prove you're a man

you will wipe it with your hand,

Stranded! Stranded on the toilet bowl!

Can you take the theme music from a TV show and change the lyrics?
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