150 artists entered the second phase of the casting which took place between late April and early May 2004, of which only 80 were selected.

The 80 selected artists entered the Academy on 19 June 2004, of which 40 finalists were ultimately chosen.

The first phase had a talent show format: it consisted of five live shows that aired in July 2004 where the contestants performed cover versions of popular songs, with the aim of advancing to the final phase.

Each act performed one song, and the televote was opened at the end of the show to select the winner.

During the third show aired on 21 September 2004, María Isabel was announced as the winner of Eurojunior 2004 with the song "Antes muerta que sencilla", Blas Cantó ended in 2nd position.