What is the Format of the September 22, 2008 release with Catalog number RTRADCD491?
CREATE TABLE "release_history" (
  "region" text,
  "date" text,
  "label" text,
  "format" text,
  "catalog" text
);
SELECT "format" FROM "release_history" WHERE "catalog"='rtradcd491' AND "date"='september 22, 2008';