What is the title for year 1991 and a date of March 21?
CREATE TABLE "recording_industry_association_of_americ" (
  "year" real,
  "date" text,
  "title" text,
  "format_s" text,
  "award_description_s" text,
  "result_s" text
);
SELECT "title" FROM "recording_industry_association_of_americ" WHERE "year"=1991 AND "date"='march 21';