Jack Harlow's Tiny Desk (home) concert feels like the arrival of a rap superstar. Tucked in a homey-looking space in Los Angeles surrounded by bookshelves and vintage furniture, the Louisville, Ky., emcee delivers a performance with the confidence of an old pro. His set, however, is the first time he's relied solely on live instrumentation to bring his songs to life. "It's been a long time since I had a chance to perform and I've never done it like this," he says.