Have you witnessed the medical benefits of @Metallica, @Megadeth slayer? Richard McDeid of Minnesota discovered that heavy metal music provided a calming effect for his son Mason, who has cerebral palsy. Together, the father-son duo have traveled across the United States to see 1,200 metal bands and even started a metal music festival that shares their passion. #cerebralpalsy #inspirational #metallica #whiplash #metalhead