What makes a song perfect? Well, our official music and pop culture critics Rob Tannenbaum (Rolling Stone, Playboy) and Craig Marks (Spin, Billboard) have some very strong opinions about that, and they promise that there isn't an imperfect song on this list. From the Beatles and Van Halen to Taylor Swift and Daft Punk, this countdown features songs from almost every era and genre...and like Ms. Poppins, they're all practically perfect in every way.