Name the genre for release-year of firsst charted less than 1980 and origin of jamaica
CREATE TABLE "75_million_to_79_million_records" (
  "artist" text,
  "country_of_origin" text,
  "period_active" text,
  "release_year_of_first_charted_record" real,
  "genre" text,
  "claimed_sales" text
);
SELECT "genre" FROM "75_million_to_79_million_records" WHERE "release_year_of_first_charted_record"<1980 AND "country_of_origin"='jamaica';