What is every media type for the Dub genre?
CREATE TABLE "list_of_works_sampling_spectrasonics" (
  "music_library" text,
  "year" real,
  "media_type" text,
  "name_of_the_media" text,
  "composition_name" text,
  "composer" text,
  "genre" text
);
SELECT "media_type" FROM "list_of_works_sampling_spectrasonics" WHERE "genre"='Dub';