SNSD's "Bad Girl"
reviewed over on the Singles Jukebox; I love the song, but most others don't consider it bad enough.
Strangely, no version I could find of the official vid had adequate sound, including the one uploaded by SM Entertainment, so I decided if the fidelity wasn't going to be high I might as well use a "live" performance. [EDIT: Well, that embed's been taken "private" and I don't know which particular performance it was, but I found one that seems good. The color change I talk about in the comments as arriving at 1:03 comes at 2:26 here.]
Click to view
And while we're at it, here's an astonishing dance routine, SNSD's beginnings in 2007;
Mat says: "This is the most impressive dance performance I've ever seen from a girl group. It almost beggars belief. The stuff around the 3 minute mark is just scary.... Helps that it's all lipsynced - it's noticeably less sharp on regular performances - and that the camera is fixed so we get the amazing sync work and units moving around the stage. I don't expect them to ever match this level again because it was their debut track and they exclusively practiced this choreography for such a long time."
Click to view