Spain participated in the Eurovision Song Contest 2004 with an entry selected through the third series of the reality-show Operación Triunfo, hosted from Barcelona by Carlos Lozano. Ramón with the song Para llenarme de ti, composed by Kike Santander, was chosen through televoting by the Spanish public. At the Eurovision final, Ramon placed 10th with 87 points.
After the regular final of Operación Triunfo (where Vicente Seguí was declared the overall winner), the top four contestants - Vicente, Ramón, Miguel and Davinia - qualified for the Eurovision phase of the contest, which consisted of two rounds and a final. Three songs were assigned to each contestant among those submitted to national broadcaster TVE, making a total of twelve songs. In the first round, a jury eliminated one of the songs assigned to each artist, leaving a total of eight. In the second round, a finalist song was chosen for each contestant through televoting. The four songs that participated in the final were "Cómo quieres que te quiera" by Davinia, "Muéveme" by Miguel, "Para llenarme de ti" by Ramón, and "Se me va la vida" by Vicente.
Spain automatically qualified for the grand final, on 12 May 2004; as part of the "Big Four". During the placement draw, it was determined that Spain would perform 1st. On 12 May, Spain placed 10th with 87 points.