what is the value of the audio with a just ratio 21:20
CREATE TABLE "size_of_intervals_in_15_equal_temperamen" (
  "interval_name" text,
  "size_steps" real,
  "size_cents" real,
  "just_ratio" text,
  "just_cents" real,
  "error" text,
  "audio" text
);
SELECT "audio" FROM "size_of_intervals_in_15_equal_temperamen" WHERE "just_ratio"='21:20';