Billie Eilish has given the music industry everything it could possibly want. An authentic new voice that appeals to teenagers and their parents. A debut album that has sold more than 2m copies in the US alone. A decisive stylistic evolution from the preceding decade’s dominant pop mode. A clean sweep of the four key categories at the Grammys. A copper-bottomed streaming success model. A James Bond theme that rejuvenates a tired franchise and extends her commercial and creative clout.