Want to make singing lighted pumpkins for Halloween?

I have looked at pre-fab LOR and really can't afford it at my home haunt for this one project.  Any plain language schematics to create this for a newbie.  I want to do "This is Halloween" and was hoping someone out there could help out with some simple suggestions to make it work without spending a fortune.  Help!  Any links to specifics or

Are you looking to make a lighted pumpkin with an MP3 player built in or are you looking to have multiple pumpkins lighting up in sequence with the music? If your looking to do the later you will need a control system and those are not cheap. It could be done with a basic micro controller like the arduino but putting together the added hardware then trying to program it all to work in time with the music will be a real challenge.