Roar and Bad Romance are often cited as Katy Perry's and Lady Gaga's biggest song ever, respectively. Both songs were worldwide smashes, have very commercially successful music videos, and were lead singles. But which song do you prefer?
The one that sounded completely different from anything on the radio, has been credited as a song that changed pop music, and that got a video that's been said to be one of the best in decades: Bad Romance
