Book excerpt: 33 Revolutions Per Minute tracks the turbulent relationship between popular music and politics, through 33 pivotal songs that span seven decades and four continents, from Billie Holiday singing 'Strange Fruit' to Green Day raging against the Iraq war. Dorian Lynskey explores the individuals, ideas and events behind each song, showing how protest music has soundtracked and informed social change since the 1930s. Through the work of such artists as Woody Guthrie, Bob Dylan, Stevie Wonder, Fela Kuti, The Clash, Public Enemy and Gil Scott Heron, Lynskey examines how music has engaged with racial unrest, nuclear paranoia, apartheid, war, poverty and oppression, offering hope, stirring anger, inciting action and producing songs which continue to resonate years down the line.