Some of the best prophetic voices of any culture are its troubadours. Historically, the term refers to traveling musicians who once strolled the streets and pubs of medieval Europe singing love songs in exchange for food and lodging. Today they travel by jet or private coach filling auditoriums with screaming fans and recording "greatest hits" albums. Regardless of the time or language, music has an almost supernatural power to affect the human soul and even change the course of the human community. It lifts our spirits, bolsters our courage, and points out injustice. A single melody can change our minds and hearts; or at least it has that potential.

It seems there's not a lot of social justice music on the airwaves these days, not like the songs that penetrated the souls of those growing…