How many million U.S. viewers watched "musical chairs"?
CREATE TABLE "table1_28680377_3" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_million" text
);
SELECT "u_s_viewers_million" FROM "table1_28680377_3" WHERE "title"='\"Musical Chairs\"';