Before attaching the turbine, you need to make sure that you position it in the correct orientation. When the wind blows, the turbine will turn in the direction away from the cup opening. So you want to match this up with direction that the music box crank needs to turn to play the music. If the cups are facing the wrong direction, it will not work.
Set the turbine down on the table. Make a large drop of hot glue on the center of the top board. Press on the crank handle of the music box. You want the drive shaft to be centered where the two boards intersect. The end of the crank will need to be offset a little so that the drive shaft will line up properly. Hold the music box in place while the glue cools. Once this first bit of glue has solidified, add more hot glue around the sides to help strengthen the joint. Again, hold the music box in place while the glue is setting. When all the glue has cooled, turn it right side up and try spinning the turbine. It should spin easily and play music.