Can popular music achieve genuine political change?

Music is able to touch us in a unique way, it can send a message out.  Music in films or in television shows can touch us depending on what context it is shown in. Ofcourse some songs can be commercial and meaningless, but many seen as popular music have had the ability to effect political change.

As John Street said we need to address not only the context of its lyrics but also its sound & reception, many bands such as U2 and Pink Floyd have wrote songs based on the idea of sending a political message and bringing on political change.

Band Aid and Live Aid have also both had massive effects on society and change, touching the hearts of people worldwide.
I believe that popular music is able to achieve genuine political change, it is a hard force against politics, as it can touch people so much that they can change their views and open their eyes to certain things. Popular music hasnt always effected political change for a good reason, it has also brought up issues of drugs and sex and violence which has confronted some political issues.