Here you will find the answer!
Step 1: Step One
2 cups Styrofoam / plastic / paper
Plastic bottle / can
Step 3: Step Three
We will use the middle part that look like a tube.
Step 4: Step Four
The slot shall measure approximately 1.5X6 centimeters
Step 5: Step Five
The parts will be attached with insulating tape.
Step 6: The End
We activate the music - and what's left is to enjoy :)