Previously I didn't know who the author was, but Joel Polowin says:
There are two versions of that parody floating around; they were apparently created independently around the same time. The version you've got is by Steven Cavanagh (scavanag@sydney.dialix.oz.au); it's on his web site at http://www.theforce.net/humor/music/songbook.shtml. Joel
YOUNG MAN, I saw your ship come down. I said YOUNG MAN, now it's muddy and brown. I said YOUNG MAN, put your weapon away, 'cause I *MEAN* *YOU* *NO* *HARM* *I* *SAY* YOUNG MAN, There's no need to feel fear. I am WONDERIN', tell me why are you here? How you GROWIN', from this food on the plate, I say *WARS* *DO* *NOT* *MAKE* *ONE* *GREAT* You must be here to see Y.O.D.A You must be here to see Y.O.D.A. He's 900 years old! He's so strong in the Force! Do your Jedi Diploma course! You must be here to see Y.O.D.A You must be here to see Y.O.D.A Come and get yourself clean! Come and have a good meal! Pretty soon now, the Force you'll feel! YOUNG MAN, you fell out of the sky, into SOMETHIN' brown that smells like a sty, and this TIN CAN started swimming and then, he got *SPAT* *OUT* *LIKE* *SOME* *THROAT* *PHLEGM* YOUNG MAN, Welcome to Dagobah. He is COMIN', master Yoda not far. I'll be HAVIN' this bright thing that ain't hot. It is *MINE* *OR* *I'LL* *HELP* *YOU* *NOT* You must be here to see Y.O.D.A You must be here to see Y.O.D.A. He's 900 years old! He's so strong in the Force! Do your Jedi Diploma course! You must be here to see Y.O.D.A You must be here to see Y.O.D.A Don't just stand in the rain! You're all covered with mud! come and sample my homemade crud! OLD BEN, Are you listenin' to me? I can't TRAIN HIM, he's so reckless you see! Like his OLD MAN, he's so angry but brave! Betcha *HE* *SCREWS* *UP* *AT* *THE* *CAVE* YOUNG MAN, If you start will you end, or be GOING, off to save all your friends? To be TRAINING, needs commitment and work, if you *WIMP* *OUT* *THEN* *YOU'RE* *A* *JERK* You gotta stay here with Y.O.D.A You gotta stay here with Y.O.D.A You should stay here and train! You don't have to save Han! If you do so, you'll lose your hand! You gotta stay here with Y.O.D.A. (repeat and fade).