I've been a Peter Gabriel fan for nearly 30 years and have seen him in concert many times. Every single time I hear and sing "Biko" at the end of a concert I get to-the-bone chills. It's just powerful stuff!
Since he offers individual concert recordings now, I was listening to the concert I saw in November, and even in recorded form it has a powerful impact. I count that song as the catalyst for my social conscience.