Beatles fans of all ages can flock to Disney Plus for a new documentary called "Get Back" that reassembles footage of John Lennon, Paul McCartney, George Harrison and Ringo Starr creating music as the band begins to dissolve. NPR used the occasion for guilt-trip clickbait: "How did we get stuck with the idea that four white guys make a rock band?" NPR music critic Ann Powers uncorked a long, unforgiving treatise on how it doesn't matter that the Beatles were progressive and loved black music because they were still somehow part of making rock music white and exclusionary: "Rock's defining...