Wow, shocked at Gaga not making it in the top 20...
Let's be real, Gaga had hits when she was making it all about the "shock factor" with her weird music videos back in the day and attention-seeking outfits. Lately she's been classier and more normal -- not much really happening that's intriguing with her. Surprised that she's not in this top 20 list? No.
It's weird that some users were calling Britney "Fad 1998" yet here she is making the list with only Pretty Girls and Make Me released in the time frame