Singify

Singify makes a cover with a few clicks. Choose a singer from Michael Jackson to Homer Simpson, choose a song (even a YouTube link) and see, or rather listen, what the result is. 

In testing, Peter Griffin (Family Guy) gave Kalevimeneste “A steamer from Viljandi” a much funnier song than Michael Jackson or Eminem's “We're on the street by the garden”. I will not post the result on purpose because try it yourself. When you log in, you get 2000 credits for free, with which you can get a couple of full-length songs or several shorter versions.