An example of a parody would be "White and Nerdy" by Weird Al, which is a parody "Ridin" by Chamillionaire.
A parody is basically a spoof.
Check out videos like this: http://www.youtube.com/watch?v=9zn7B0PqAp8
Venetian princess or rucka rucka teevee on YouTube.Many songs by Weird Al Yankovic are parodies.
Try some of the songs by Weird Al Yankovich, Rucka Rucka Ali, Tomster, or GoBlueKillRed. These guys can be found on youtube.
Heavy sentences after a parody of justicebad sentence
The Shrek films parody many fairy tales, as does the TV Miniseries The Tenth Kingdom.