Intro?

Once upon a time there was probably a goose
there were probably lots of geese,
and this goose was no exception
but he didn't know that,
because he was just a goose

A human thing was around,
and that's what he thought he would be,
because there was no one said who said that he couldn't

So he did, or he tried, and he left geese behind
to show people a goose with a tuba*

(it was actually a sousaphone, but geese don't know that)