When Amaarae began work on her latest project, Fountain Baby, she knew she wanted it to defy labels. On one hand, it’s defiantly pop, but it’s persistently kaleidoscopic, built on a consistently surprising world of sound that draws from alternative Afrobeats to punk rock, R&B, bubblegum pop and more. As NPR Music editor Sheldon Pearce says on this week’s show, …