"If I Had a Hammer" is regarded as one of the most effective and influential social protest songs in American history. The song quickly became an anthem for the Civil Rights Movement and other social justice causes.
The lyrics speak of the power of unity and the ability of ordinary, every-day people, to effect change on society. The song's message of justice, equality, and freedom resonated with many people who were fighting for these causes.
The song was particularly effective in its use of simple and memorable lyrics, and a kind of melody that made it easy to sing and remember (and get stuck in your head).
The song was covered by many different artists and performed in a variety of musical styles, helping to increase its reach and impact.