Music is either sacred or secular. The sacred agrees with its dignity and here has its greatest effect on life an effect that remains the same through all ages and epochs. Secular music should be cheerful throughout.
Our criminal justice system is fallible. We know it even though we don't like to admit it. It is fallible despite the best efforts of most within it to do justice. And this fallibility is at the end of the day the most compelling persuasive and winning argument against a death penalty.