Marc Anthony is an amazing performer on his own, but one of his biggest hits was made even better with the help of none other than Will Ferrell....and his cowbell, of course.The Maestro Cares Foundation--which was founded by the singer in 2012 to improve the quality of life of disadvantaged children and communities in Latin America and the U.S.--held its annual gala on Tuesday, December 7 in New York City.