Inside the secret TikTok library that turns viral songs into brand soundtracks

If you’re a sports fan on TikTok, you’ve almost certainly heard the song “Orla” by the British DJ and producer Nimino. Since its release in early March, the song has soundtracked nearly 150,000 videos on the platform.  For Nimino, that doesn’t just mean more exposure for his music. It means money. A lot of the sports-world accounts that have used his track are businesses—Atlético de Madrid, the “Men in Blazers” podcast, Major League Baseball, the LPGA, and the Philadelph...