My friend knows grief and mourning. I met him at a memorial jam for his son, also a musician, who died young with cancer. Musicians who had played with him over the years, and also with his son, gathered with their horns, guitars, keyboards, and drums. “Jazz is pure America,” he said. “A community of equals that keeps creating something entirely new together.” They played through the evening. Then they showed us the second line, beginning with a mournful song that ever so slowly, and then with enthusiasm, transformed into an uplifting joy that swept us all into it. How could the same sad song become a song so joyful?