I can recall a few of the lyrics. First verse was something like:

Newbold (?) Morrison (?), our park commissioner
Says "stop the music", and that they will do
Let not a note be heard, from neither man nor bird
Strike down guitarists, oh Morris so bold (?)

Second verse has the line about "our country's anthem from this motley crew" but I can't remember the rest. Seems to me there was a line about nightsticks and "there's always tear gas" if people refused to leave.

Last verse concludes with:

"up with the surging mass
down with the holy grass
fight for the park's rights (?)
or Morris so bold"

No idea how accurate any of this is. It's drawn from long-ago memory. I actually have the album (on vinyl) but where it's gotten to....I have no idea.