Link to the video: http://youtu.be/j7lp3RhzfgI
The song is written and performed by Paul Sabourin and Greg “Storm” DiCostanzo (aka Paul and Storm), who have done a lot of other entertaining stuff. This page has the lyric and a link to buy the song, assuming you're a Good Person who likes to support worthy independent artists.
Incidentally, the non-singing guy in the video is Jeff Lewis, who plays Vork on Felicia Day's on-line comedy television series The Guild about people who spend vast amounts of time playing an Internet game.
Update: George R.R. Martin and fellow author Neil Gaiman take amusing issue with Paul and Storm over the song at the opening of W00tstock 5.0: