Light/Sound kit to make singing pumpkins

Small, Home neighborhood haunt.  I can't really afford the Light O Rama that coordinates the lights and sounds.  Anyone have anything for sale or novice directions on how to accomplish this?  You can see many versions on You Tube,and I'm looking for use in foam carvable pumpkins with a Halloween themed music loop. 

http://youtu.be/p7cjCR60ix8