Technically not "Lyrics", but I do have it on a record.

NI!
NI! NI! NI! NI! NI!
WHO ARE YOU?
WE ARE THE KNIGHTS WHO SAY... 'NI'!
NI!
NO! NOT THE KNIGHTS WHO SAY 'NI'!
THE SAME!
WHO ARE THEY?
WE ARE THE KEEPERS OF THE SACRED WORDS: 'NI', 'PENG', AND 'NEEE-WOM'!
NEEE-WOM!
THOSE WHO HEAR THEM SELDOM LIVE TO TELL THE TALE.
THE KNIGHTS WHO SAY 'NI' DEMAND A SACRIFICE.
KNIGHTS OF NI, WE ARE BUT SIMPLE TRAVELLERS WHO SEEK THE ENCHANTER WHO LIVES BEYOND THESE WOODS.
NI!
NI! NI! NI! NI! NI!...
OW! OW! OW! AGH!
WE SHALL SAY 'NI' AGAIN TO YOU IF YOU DO NOT APPEASE US.
WELL, WHAT IS IT YOU WANT?
WE WANT... A SHRUBBERY!
[DRAMATIC CHORD]
A WHAT?
NI! NI! NI! NI!
OW! OH!
PLEASE! PLEASE! NO MORE! WE WILL FIND YOU A SHRUBBERY.
YOU MUST RETURN HERE WITH A SHRUBBERY, OR ELSE, YOU WILL NEVER PASS THROUGH THIS WOOD... ALIVE.
O KNIGHTS OF NI, YOU ARE JUST AND FAIR, AND WE WILL RETURN WITH A SHRUBBERY.
ONE THAT LOOKS NICE.
OF COURSE.
AND NOT TOO EXPENSIVE.
YES.
NOW... GO!