Shake It Off has one of the greatest melodies in pop history - that chorus is one of the most infectious lines ever. You can't escape it. You can't get tired of it. It is by far going to be her second biggest classic and signature hit (replacing You Belong With Me and sitting right behind the #1 standout Love Story).
Sorry Meowster but I can't understand this. Shake It Off has a very plain and unadventurous melody and it doesn't help that it's 90% repeating the same word over and over.