Frequent music chills were an unexpected side effect of my meditation practice. It matches with their "openness to experience" conclusion.
I also found out that you can encourage chills with meditative techniques:
1. Play your song, for example Sogno di Volare.
2. Close your eyes.
3. Think about awesome things: how cool it is that humans invented airplanes and rockets and satelites.
Scientific studies grasping for explanations to spiritual things always give me a smile. This is the way. It’s about opening up to the energetic experience being conveyed through the medium (art, music, whatever). Has nothing to do with individual variations in biology or physiology.