user: Question: When Conjunction Junction is the episode title and the music is by Bob Dorough who is the performer?
Columns: ['Episode title', 'Subject', 'Music by', 'Lyrics by', 'Performed by', 'First aired']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Conjunction Junction', 'conjunction', 'Bob Dorough', 'Jack Sheldon and Terri Morel', 'Jack Sheldon', '1973']
SQL:

assistant: SELECT "Performed by" FROM "Table" WHERE "Music by" = 'Bob Dorough' AND "Episode title" = 'Conjunction Junction';