By Mopsy Strange Kennedy | The Improper Bostonian

Progressive causes often go hand–in-microphone with songs. During the 20th century—and the start of the 21st century—these issues included organized labor, women’s and civil rights, the environment, gay pride, immigration, nukes and the coddled 1 percent.

In his latest book, Which Side Are You On? 20th Century American History in 100 Protest Songs, frequent Boston Globe contributor James Sullivan writes a detailed history of these blazing movements and the songs that join in, making us long for the music.

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