I just read a dailykos diary about Six Puerto Ricans artists and musicians who support Puerto Rico's sovereignty interrupted the U.S. congress today singing 'Oubao Moin' (a patriotic Puerto Rican [sic] folk song, carrying.with signs that read '111 years of Colony'' ''It's a shame: End the colony" and carrying the national flag of Puerto Rico.

http://www.dailykos.com/storyonly/2009/5/6/728539/-Puerto-Ricans-disrupt-U.S.-Congress-session

Puerto Ricans disrupt U.S. Congress session
by parsley44   
Wed May 06, 2009 at 01:39:35 PM PDT

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I was going to post this to this thread African American Protest Slogans & Songs which includes some interesting opinions as to why there appears to be so little (if any) protest singing by demonstrators at rallies and marches. But then I realized that by its name the subject of that thread was limited to African Americans. I then went looking for more appropriate thread on this topic and found this one.