New Britney Spears single "Till The World Ends"

Blow by Kesha is a much better song. You can tell that Kesha wrote it because it is better than Britney's own work, but still nowhere near as catchy as any of Kesha's. Obviously she did this on purpose.

Harmony is also one of the main elements in the music video for Blow. Does this dumb Britney song have any harmony? Nope.