BEGIN
  UPDATE artists
  SET total_plays = total_plays + 1
  WHERE name_string = NEW.artist_name;

  UPDATE albums
  SET total_plays = total_plays + 1
  WHERE key = NEW.album_key
    AND artist_name = NEW.artist_name;

  UPDATE genres
  SET total_plays = total_plays + 1
  WHERE id = (
    SELECT genres
    FROM artists
    WHERE name_string = NEW.artist_name
  );

  RETURN NEW;
END;