http://www.newgrounds.com/audio/listen/5437 This is a song made by ParagonX9, used in Riddle School 3, 4 and 5.
In Riddle School 3Edit
http://riddleschool.wikia.com/wiki/Riddle_School_3 In Riddle School 3, it was the main theme of the game. Not much to say.
In Riddle School 4Edit
http://riddleschool.wikia.com/wiki/Riddle_School_4 Main theme again.
In Riddle School 5Edit
Dream of Smiley's. Walkthrough: http://riddleschool.wikia.com/wiki/Category:Riddle_School_5_Walkthrough