You were able to sing something they related to instantly, because it was part of what you felt. It was part of what you had already traveled through. It's part of the people you were associating with daily. It was all of that.
I do get angry some time, but if I let that feeling take over it would only cloud my thinking and disable me from making the right decision when it counts the most. I just try to think about my mother, children, God, and of course my freedom.