The heartbreak was palpable at the Black Box Theatre's Saturday-night opening of Lady Day at Emerson’s Bar & Grill. Transformed into a quaint cabaret, the space featured a small stage with a single stool and microphone, with a bar (dutifully tended by server LuAnne Sisk), a three-piece band, and two tables rounding out the experience. And from the moment the lights went down, audience members were treated as patrons of Emerson’s establishment, whisked away from the Quad Cities, and transported to 1959 Philadelphia – for Billie Holiday’s last concert.