Table: episode_info_4
Columns: episode_title
subject
music_by
performed_by
first_aired

Question: When interplanet janet is the episode title who is the music by?
SQL: SELECT "music_by" FROM episode_info_4 WHERE "episode_title" = 'Interplanet Janet'

Question: WHen jaime aff and christine langner are the performers what is the subject?
SQL: SELECT "subject" FROM episode_info_4 WHERE "performed_by" = 'Jaime Aff and Christine Langner'

Question: If skeletal system is the subject when was it first aired?
SQL: SELECT "first_aired" FROM episode_info_4 WHERE "subject" = 'Skeletal system'

Question: When zachary sanders is the performer what is the lowerst first aired?
SQL: SELECT MIN("first_aired") FROM episode_info_4 WHERE "performed_by" = 'Zachary Sanders'