Taylor Swift went back to basics for her American Music Awards performance of “Back to December” — at first. Sitting at a piano, Swift brought vocals a tad somber for the Christmas-y set — but the singer stood up in the song’s final moments and switched gears, performing a brief cover of OneRepublic’s “Apologize.” I’ll leave whether or not her vocals were on point to you, Music Mixers, but, surely, many will also be wondering: Who was Swift singing to? (Please don’t tell me we’re about to open up this whole Kanye thing up again.) And more importantly: Straight or curly?