Pop video mash-ups

Not sure if these can be called mash-ups...more like re-edits. This YouTuber created re-edits by using songs like Christina Aguilera's "Ain't No Other Man" and then making it look like Beyonce sung it. It's kind of interesting to see how the same dance moves and lyrics are used repeatedly over and over in pop videos. Below is the re-edit for Justin Timberlake's "What Goes Around" using Justin's and Britney Spears' past videos (rumor is that this song is directed at Britney for cheating on Justin). The individual videos aren't that great but this girl has great editing skills and makes it work.