Unless you’ve been living under a proverbial rock, you’re probably well aware of the name Billie Eilish. The young singer has become one of the biggest names in the music industry and has a legion of devoted fans around the world. But even if you’re completely unfamiliar with the work of Eilish, you’ll still probably really enjoy the recent documentary, “Billie Eilish: The World’s A Little Blurry.” And in this episode of The Playlist Podcast, filmmaker R.J. Cutler joins us to talk about his new film about the musical superstar.