This year, rap entered its classic-rock phase (Eminem is the new Freddie Mercury!) and the best music video wasn't a video at all but a movie starring James Franco singing Britney. Which is to say: It was a wild, confounding, and thrilling twelve months of music. Here, we talk it out with a little help from Questlove and Vampire Weekend—and get a lesson in how to listen to music from none other than Rick Rubin