Cov-er [kuhv'-er]-noun: a recording of a song that was first recorded or made popular by somebody else
There are a ton of covers out there--popular music is full of them. Everything from Madonna doing American Pie (Don McLean), to Alien Ant farm doing Smooth Criminal(Michael Jackson). Even Christian music has it's share of covers, the most popular of which are done by DC Talk--The Cross (Prince), In the Light (Charlie Peacock), Lean on Me (Bill Withers), etc.
Every once in a while, there comes a cover that makes you do a double take. I found one last night. Matt Weddle, of the band Obadiah Parker (a band I've never heard of, but will look more into now), does a cover of the song Hey Ya by Outkast. Just him on the acoustic guitar:
There are a lot of other cool covers out there too. I've linked some below for your auditory pleasure. Enjoy.
Franco Battiato - Ruby Tuesday (Rolling Stones) (This video is really bad. Just minimize the youtube window and listen.)
Blue Man Group - Baba O'Reilly (The Who) (Incidentally, anything by the BMG is very, very cool)
Snow & Voices - Go Your Own Way (Fleetwood Mac)
Chris Dunnett - Blue (Da Ba Dee Da Ba Di) (Eiffel 65)
Kevin Max - The Cross (w/ DC Talk) (Prince)
I'm not sure if this is a cover or a re-mix, but I'll include it just because:
Pussycat Dolls - Destiny (Jai Ho) (A.R. Rahman/Slumdog Millionaire)