Green Day's newest single 21 Guns, sounds very uncomfortably familiar to Avril Lavigne's multi-platinum hit song, "Complicated", and it's only a matter of time before her publishing company and former label, Arista, begin to take notice. The similarity is so blatant, that you can actually play the two songs at the same time and hear the same exact chord progression and rhythm.
What was Green Day thinking!? It would be a tragedy to see such an iconic rock band, get involved in a career damaging copyright lawsuit.
Here is the fact 
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2009-7-13 13:07#1
Green Day's newest single 21 Guns, sounds very uncomfortably familiar to Avril Lavigne's multi-platinum hit song, "Complicated", and it's only a matter of time before her publishing company and former label, Arista, begin to take notice. The similarity is so blatant, that you can actually play the two songs at the same time and hear the same exact chord progression and rhythm.