personally this is the #1 Skrillex song because it is in one of his first albums. This song got him popular.
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2.Skrillex First Time Of The Year
This song was invented in 2014 and it was the number one song for it's base drop. That is why this is the #2.
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3.Skrillex Cinema
This is a awesome remix of the real song. This was one of his first remixes and this got him even more people to like his music.
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4.Skrillex Lady Gaga Bad Romance
This ones has the best bass drop of them all. Back when Lady Gaga was famous so many people liked this song which got more people to like him and more people to like Lady Gaga.
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5.Skrillex Recess
This is awesome because this is one of his first ever songs and this is what got him started.