From the Arab Spring this artist came up with one of the first songs I have heard thus far:
JasonZ - Man On Fire
Written in honor of Mohammed Bouazizi, Man On Fire is intended to inspire everyone around the world who is trying create positive change because their government is corrupt and/or inept. 100% of the profits from this song will be spent to remove corporations ability to dictate the priorities of our government through "contributions".
It may not be completely applicable to OWS but it is interesting.