CREATE TABLE table_22806 ("Episode title" TEXT, "Subject" TEXT, "Music by" TEXT, "Performed by" TEXT, "First aired" FLOAT)

When interplanet janet is the episode title who is the music by?
SELECT "Music by" FROM table_22806 WHERE "Episode title" = 'Interplanet Janet'
SELECT "Music by" FROM "table_22806" WHERE "Episode title" = 'Interplanet Janet'