The Black Eyed Peas have showed interest in the problems of the world in their songs. They also took part in some charity but this time it is something big for them. “Being in Mexico is special to all of us, being from Southern California,” singer Fergie added. “They call Will a “blaxican” because he grew up with all Mexican friends and family. Taboo, of course, being of Mexican heritage. My great-grandmother is from Guanajuato…