Diana Ross, Jody Watley and Mariah Carey are on point for LGBTQ culture and the era — from 1987 to 1994. Much of Season 2 revolved around Madonna’s 1990 strike-a-poser “Vogue,” while last week’s episode gave us a double dose of Donna Summer with “She Works Hard for the Money” and “Once Upon a Time” that had us really working it.The HBO series, which is expected to return for its fifth and final season later this year, always hits just the right notes with its music.