Which title did richard kolner play?
CREATE TABLE "1921_1930" (
  "title" text,
  "date" text,
  "theatre" text,
  "role" text,
  "dance_partner" text,
  "director" text,
  "lyrics" text,
  "music" text
);
SELECT "title" FROM "1921_1930" WHERE "role"='richard kolner';