One person who comes to my mind who is a) arguably a creative boundary-breaking genius and b) has some degree of success within mainstream pop is Rosalía. But s

One person who comes to my mind who is a) arguably a creative boundary-breaking genius and b) has some degree of success within mainstream pop is Rosalía. But she's more of an "artist's artist". A lot of modern pop icons cite her as an influence, but she's not nearly as well known as those are.