Sergio Contreras was no stranger to Spanish pop audiences when "Llena de Luz y de Sal" hit the market in 2005. Contreras was a longtime music business veteran by the time he chose to focus on songwriting and performance, having worked for years as a radio DJ and spinning in clubs throughout Andalusia. Born in Huelva, Contreras had developed a sharp musical ear and longed to unite the flamenco music of his heritage and the R&B/hip-hop that he worked with as a DJ. Having earned a reputation in the region as a top DJ, he began work toward these ends in 2004 with "Racisme (Maqueta...