This version was of Mark McLemore, a member of an a capella group Street Corner Symphony, recorded himself doing a ton of sound effects from Gangnam Style and then layered the recordings into one video. So basically he sang the entire song and its music by himself through many, many clips. Funny and worth listening to - http://www.youtube.com/watch?feature=player_embedded&v=2F5rQBfqPQ4
To be honest, I didn't know about this song until I watched a parody of the video on TV. Obviously, I didn't get it until I watched the original one.
I guess it's not a bad song, but I'm not a fan of it. For me, the song has become pretty annoying after listening to it about once every hour, so I usually change the station if I hear it on the radio.
I liked the song when it originally came out, but now it's on almost every decent music station once every hour or two, which is quite irritating. It is a good dance song, though.