Hi! Here's what I think needs to be done with the article; I've organized it by section for your ease of use. I've watchlisted this page, so if you have any questions or if you disagree with what I've suggested, you can poke me here or on my talk page. Nice work! I'm impressed. Keilana|Parlez ici01:05, 30 May 2012 (UTC)[reply]
Lead
There should be an "and" before "Greg Kurstin". You could change the comma to a semicolon and say "it was produced by Kurstin" or something to that effect.
The sentence "The song is considered as an anthem for recovery after the end of a bad relationship" sits funny with me, perhaps you could reword it as "The song has been received as an anthem for recovery after the end of a bad relationship" or something.
In "it became her third song", I would change "her" to "Clarkson" and change "making Clarkson the first" to "making her the first". That way, the antecedent is the most clear.
"Lyrically, the song is about moving on from a nasty ex who won't leave you alone." needs to be rewritten in a more formal style and in the third person.
"The scenes are shown alternately for about half way through with a variety of montage that show people from various places performing the same dance routine." and "The final scene shows Clarkson and the crowd disperse as the song comes to an end." need to be rewritten.
"Leah Collins of The Vancouver Sun interpreted that the video depicts Clarkson who develops strength and endurance as well as the ability to lead a large-scale dance routine after surviving a trauma" is very clunky.