Protest songs have always been a major part of music, rock and roll in particular. Over the years, certain rock songs have become rallying cries for various groups of oppressed or downtrodden people ...

In 1980, Pink Floyd scored a rare chart triumph when "Another Brick in the Wall, Part 2" became the band's only No. 1 hit on the Billboard Hot 100. By that point, the group was already one of the ...