In April, T-Pain discovered a wealth of missed Instagram direct messages that caused a social media frenzy after he posted a reaction video apologizing to the many celebrities who reached out over the years. A brief clip of T-Pain opening up about a difficult conversation he had with singer Usher, early in his career, has received national headlines, too. Usher allegedly told the Tallahassee singer he damaged the music industry “for real singers.” “I don’t even think I realized this for a long time — that’s the very moment that started a four-year depression for me,” T-Pain said in a clip from a Netflix docuseries “This Is Pop,” out Tuesday.