NEW YORK -- It’s the early ’90s and a preteen Johnta Austin is in the studio working on his debut album with a pair of unknown producers named Pharrell Williams and Chad Hugo.Trading ideas, hearing beats and writing melodies — along with a future Grammy-nominated singer-songwriter named Joe — the artists were vibing out and creating magic.Until Austin hit puberty.“I got signed when I was 13, dropped when I was 15,” Austin explained.