CREATE TABLE table_191105_2 (performed_by VARCHAR, music_by VARCHAR, episode_title VARCHAR)

When conjunction junction is the episode title and the music is by bob dorough who is the performer?
SELECT performed_by FROM table_191105_2 WHERE music_by = "Bob Dorough" AND episode_title = "Conjunction Junction"
SELECT "performed_by" FROM "table_191105_2" WHERE "Bob Dorough" = "music_by" AND "Conjunction Junction" = "episode_title"