Enter the ­National Arts Club, a Victorian Gothic Revival brownstone off Manhattan’s Gramercy Park; climb four winding flights of stairs; pass the Pastel Society of America; and there will be the offices of director Wes Anderson’s longtime music supervisor, Randall Poster. And though in summer 2023 Hollywood is at a strike-induced standstill, Poster, creative director of Premier Music — the advertising-focused music supervision agency — is as busy as ever. (Update: A tentative deal has been reached between screenwriters and the studios, streaming services and production companies.) Poster’s...…Enter the ­National Arts Club, a Victorian Gothic Revival brownstone off Manhattan’s Gramercy Park; climb four winding flights of stairs; pass the Pastel Society of America; and there will be the offices of director Wes Anderson’s longtime music supervisor, Randall Poster. And though in summer 2023 Hollywood is at a strike-induced standstill, Poster, creative director of Premier Music — the advertising-focused music supervision agency — is as busy as ever. (Update: A tentative deal has been reached between screenwriters and the studios, streaming services and production companies.) Poster’s...WW…