Over time, the songs have come to protest more abstract, moral issues, such as injustice, racial discrimination, the morality of war in general (as opposed to purely protesting individual wars), globalization, inflation, social inequalities, and incarceration.
隨時間推演，抗議歌變得用來抗議更抽象、更精神層次的議題，例如不公正、種族歧視、戰爭大體的道德準則（as opposed to purely protesting individual wars）、全球化、通貨膨脹、社會不平等和有期徒刑。