The #1 song in South Korea right now is from a KPOPSTAR performance (original song no less) by a sibling duet. http://www.youtube.com/watch?v=tgkVdxi-D0Y (equivalent of a contestant on American Idol performing an original song in Hollywood week and it become #1 on Billboard Hot 100 in the USA.)
This cover of MJ Thriller is getting a lot of buzz.... Will it hit #1 when it is released as a single?