As recently as 18 months ago, much of the world had never heard of Billie Eilish, Lizzo or Lil Nas X. In a first in Recording Academy history, two artists — Eilish, the teenage goth-pop phenom who grew up home-schooled in Highland Park, and Lizzo, the body-positive R&B belter whose breakout tune proudly announces she’s “100% that bitch” — both …