What, you don't know the Go Go Mario? Here is the song, from a live representation back in 2003:
You know this is the official version with vocals as far as Nintendo go.
If you wanna check out the lyrics in English, check the description of the any of these videos. And if you miss the American version, well let's DO THE MARIO with this opening theme song instead:
I always loved the way he almost falls down there at the end. Hey, he also made a clumsy step during the beginning of the intro as well!