Abstract: In the 1990s a general framework was proposed in which black holes are matched to fundamental string states at a "correspondence point", where their properties, including their entropy, agree with each other. However, this correspondence becomes puzzling when attempting to include rotation: At large enough spins, there exist degenerate string states that seemingly cannot be matched to any black hole. Conversely, there exist black holes with arbitrarily large spins that cannot correspond to any single-string state. After introducing these ideas, I will discuss work (to appear) with Ceplak, Puhm and Tomasevic, where we explain how rotating black holes and strings evolve into each other, thus establishing the correspondence between them.