"Billy The Mountain" By Frank Zappa. It goes on 24 Minutes long, but it certainly cracks me up. It makes me think of Yahtzee just because the song feels like it, too, has zero punctuation.
"Why does it Hurt When I Pee?" Also by Frank Zappa. His ode to something he might have caught definitely scores a major laugh from me all the time, and the line "My Balls Feel Like a Pair of Maracas."
I laugh as I write that sentence.
Albuquerque and Your Horoscope For Today Both By Weird Al are just awesome.
Favorite Line From "Your Horoscope For Today":
Now's Not a Good time to Photocopy Your Butt and Staple it to your boss's face, oh no.
Eat a Bucket of Tuna Flavored Pudding, than wash it down with a gallon of Strawberry Quik.
Favorite Line from Albuquerque:
"If you'd like to make a call, please hang up and try again, if you need help, please hang up the phone and dial your operator." ~ We may hear it on a phone enough times, but he sings it... and that makes me happy.