From “Spinal Tap” to “Popstar”: Best Rock Mockumentaries

Rolling Stone’s David Fear, Rob Sheffield and Nathan Brackett delve into Lonely Island’s new Justin Bieber send-up, “Popstar: Never Stop Never Stopping” and ask the bigger question: Why are the best movies about music so often mockumentaries? Plus: New music from Car Seat Headrest, Joey Purp and Hotelier; and readers weigh in on Phish

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