About a year ago, I cried tears of joy. A friend and mindfulness meditation instructor shared the dramatic results brought about by a six-month music-based mindfulness program that he offered at the King Street Youth Center in Burlington, Vermont.  The center's focus is high-risk youth and offers after-school activities. Teal Scott invited the kids, ages 12-18, to join his group for two evenings per week. He told them that he would download their favorite music and serve snacks.

The staff...