When I was a boy of 11 in 1968, the musical Hair was a big deal. I thought I was cool singing its songs to myself. My father told me I wouldn’t if I knew what those Latin words meant. I looked them up, blushed, and stopped.

Hair shocked society because of its frankness about sex, its naked stage performers, hippie culture, progressive thinking on race, and opposition to the Vietnam War. But unlike today’s revolutionaries, it approached those issues emphasizing individual freedom.