Dictionaraoke.org - The Singing Dictionary
Definition: This site features parodies of popular songs using karaoke-style backing music with vocals provided by audio pronunciation samples from online dictionaries.
It's pretty funny but it might drive you insane. Here are a few examples though:
ABBA's Waterloo
Metallica's Enter Sandman
Tom Jones' What's New Pussycat?
Dictionaraoke.org - The Singing Dictionary
via Smidigt.se
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