Singer Marc Anthony helped get things started in Dominican Republic's Presidente Latin Music Festival on Friday (October 14, 20005) with a performance that included a surprise appearance on stage of his wife, Jennifer Lopez. Lopez, also known as J-Lo, performed two songs with Anthony in what was her first performance in the Dominican Republic. Their performance closed out the first night of concerts that also featured Argentina's Diego Torres and Mexico's Julieta Venegas. The three-day Presidente Latin Music Festival is a bi-annual event that attracts some 50,000 spectators and is held in the Felix Sanchez Olympic stadium. Other acts taking to the stage at the event that ended on Sunday (October 16) were Puerto Rico's reggaeton singer Daddy Yankee, Chayanne and Dominican merengue singer Sergio Vargas.