I'll be the first to admit that lately I have not been the biggest fan of Taylor Swift's music. I'm usually on board with her new music at first, but after hearing it a few times, I'm over it. But apparently, if you put Demi Lovato's "Heart Attack" with Taylor Swift's "I Knew You Were Trouble" it's like a brand new (& way better) song. Granted, this is only my opinion. What do you think of the mashup?