OK, call me a "Johnny Come Lately". Yes, I really dig the song by Gotye "Someone That I Used To Know".  Very haunting and easy to remember.  But Robert J. Wright pointed out that this song was actually covered by another group called Walk Off The Earth, before Gotye became popular.

While both songs are great. The version from Walk Off The Earth has 5 people playing this song on 1 guitar.

To compare the 2 versions, here is the Gotye version.