With tropical rhythms and cumbias, dozens of people gather to dance in the center of the Mexican city of Tlaxcala to celebrate the "sonideros," popular DJs who offer musical performances in neighborhoods and towns across the country. "When I dance, I feel a lot of emotion, I feel warmth in my body, I feel joy," says 22-year-old Mitzi Gonzalez who attended the mass dance organized by the authorities. IMAGES AND SOUNDBITES