Gagá derives from the carnivalesque Haitian Rará, which is an Afro-Creole processional celebration that has a specific rhythm and dance. The migration of Haitian Rará to the Dominican Republic results from the movement of laborers from Haiti to Dominican cane fields...
more on : http://hemi.nyu.edu/eng/seminar/usa/studentwork/suriel/hemipaper.html
*This is an interview with Boni Raposo y La 21 División performed by the NYU Hemispheric institute of Performance and Politics
The music of Boni Raposo can be purchased at: http://www.cduniverse.com/search/xx/music/pid/7528706/a/Afro-Caribbean+Chants+And+Drums.htm