Puerto Rican Tony Tun Tun (created Juan Castro) got involved with music while attending Carolina’s Escuela Libre de Musica, getting the possibility to play with an area philharmonic orchestra. He quickly became a member of Victor Roque and La Gran Manzana. After taking part in Grupomania, Tony Tun Tun started composing for the merengue work Grupo Karis. He debuted like a single artist using the launch of Caminando, performing its title alongside Elvis Crespo. In 2000, Juan Castro came back with Con la Musica Por Dentro.