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This year is basically shaping up to be Lady Gaga's best year ever, and she slayed so much on American Horror Story: Hotel that we almost tend to forget that she's first and foremost a killer pop artist. Gaga has had so many huge hits — "Poker Face" and "Bad Romance" among them — but did you know that Gaga is also a songwriter who has written tracks for other artists? Here are the songs Gaga wrote for other musicians like Britney Spears and Adam Lambert.