Until recently, I’d only known Jane Horrocks as the ditzy secretary Bubble on Absolutely Fabulous. But she is a highly talented singer, capable of perfectly mimicking everyone from Judy Garland to Ella Fitzgerald to Marlene Dietrich to Marilyn Monroe. When she starred in Cabaret, if she’d wanted to, she could’ve belted this number out as gorgeously as Liza Minnelli. But instead, she chose to embody one of the core truths about Sally: Sally’s a mediocre talent with limited prospects. She sings at a run-down club because she’s not good enough to make it anywhere else. And that mediocrity is what fuels Sally’s desperation and self-destruction.