The group's debut album, released in October 2002, had become a triple platinum record by 2003.
Over 4,000 young men auditioned in the Club Hípico Argentino, and in October 2002 the final selection released their first album, self-titled Mambrú, which went triple platinum selling over 120,000 units.
In December 2002, they performed a joint concert with Bandana in José Amalfitani Stadium.
In July 2003, Milton Amadeo left the band to pursue a solo career.
Their aim was to 'sing to the entire country', and local bands were recruited to work as supporting artists in their various hometowns.