Apparently funtwo became very very very famous because of this. Below's some info about him (found in Wikipedia), in case you're interested:
Jeong-Hyun Lim (임정현), also known by the online alias funtwo, is a 23-year-old South Korean guitarist known for his cover of JerryC's Canon Rock. Lim has been playing the electric guitar for 6 years (self-taught, though he attended formal guitar lessons for only one month in 2000).
Lim attended Auckland University in New Zealand before moving to Seoul, but plans to return to New Zealand in March to continue his degree in Technology. He says: "I think the quiet and peaceful circumstances of Auckland really helped my musical motivation." He says that whilst living in Remuera, Auckland he was a musical catalyst.
Funtwo's cover of Canon Rock had garnered 16 million views, over forty-two thousand comments and favorited over one hundred and seventeen thousand times, as of March 11, 2007. It is the fifth most viewed, most discussed, and second most favorited video on YouTube. It has been mentioned on CNN, 20/20, The New York Times, and National Public Radio in addition to MBC news, KBS news, and other Korean news stations.
Many viewers have speculated and thought the video as fake since the music is not in proper sync with the video. Lim later stated to The New York Times that this had to do with the fact that "[…] he says he recorded the audio and video independently and then matched them inexactly."
There is a re-synced version of the video here.
Due to the initial secrecy surrounding the guitar player in his video, several other people have claimed to be Funtwo. One of these was Alfonso Candra, a 12 year old classical pianist who performed 'Canon Rock' for a small crowd at the Indonesian Embassy in Washington, DC in August of 2006.