Jeremy Helligar Lena Waithe is on a mission to return Black music to its glory days. The multitalent, whose résumé includes hot shows like “Master of None,” “The Chi” and “Twenties,” has added head of Hillman Grad Records to her many roles, and she’s looking to vintage Black superstars from the ’90s for inspiration.“I’m young enough to remember Toni Braxton, hearing her song [‘Love Shoulda Brought You Home’] in ‘Boomerang’ for the first time and going, ‘Who is that?,’ and then watching her career pick up and flourish,” recalls Waithe, 37, who executive produces the BET TV series based on the 1992 film.