Taylor Swift's "I Knew You Were Trouble" is really good. This will be a harder review, as I don't really know what exactly I like about it. The catchy beat, maybe? Or perhaps the clever lyrics? There's something I really like about it that the rest of her songs don't have. Maybe it's the drop after, "Now I'm lyin' on the cold hard ground!" The could be it. OHHHHHH! OOOHHHH!! I do know that I like the techno instrumental, and I like that she didn't overdo it, which I think would have been easy to do, so good job on that, Taylor! It has nice drops into the dramatic bits, but it also gets quiet at the right times. She also did a good job layering herself over herself. Some artists have a great deal of difficulty with this; her's flowed very well. Vocals, I'd give 8/10. Why? I can't give 10/10 to everyone or it would be meaningless. Her voice is really good, but not my favorite. I'd give the instrumental a 8/10 as well for the same reason.