Arturo Castillo, Jr. (born October 16, 1986, in Austin, Texas), better known as AJ Castillo, is an American singer of Mexican descent. He is a cumbia, and Tejano music recording artist, accordionist, singer, performer, and producer. His debut album, "Who I Am", was released in 2009. His second album, On My Way, was released in 2010. Castillo won Best New Artist – Male at the 2010 Tejano Music Awards.
