Why might musicians use their music to raise awareness and consciousness about different social issues?

The video below provides a first-person narrative of a

young couple's passion for the arts as they transform their

community from an 'arts' desert to an 'arts' showcase

providing a venue for activist musicians to find audiences

they might never otherwise connect with.     Please watch

the video called Building Community through the

arts which demonstrates how important every single

individual can be in building a deep sense of community.  

In your initial post, please address the following:

 Why might musicians use their music to raise awareness

and consciousness about different social issues? In your

response please use at least one example (from the video,

from your own community or from a different resource) in

order to illustrate your points.