According to the text how did protest music in america develop over time

Speaking and Protesting in America," presents a diverse range of public radio and television content including radio programs, local news, raw footage, and interviews that reveal the profound impact of the First Amendment on American life. Focusing on our right to speak, assemble, and petition, this exhibit explores the role of dissent in American life in its protected and unprotected expressions ranging from peaceful marches to acts of civil disobedience.