After achieving modest fame in Puerto Rico for his work in television commercials, Martin auditioned for membership in the Puerto Rican boy band Menudo. Although the executives enjoyed his dancing and singing at his first two auditions, Martin was rejected because he was too short. By the third audition, his persistence impressed executives, and in 1984, 12-year-old Martin became a member. A month after joining Menudo, he made his debut performance with the group at the Luis A. Ferré Performing Arts Center in San Juan. During this performance, he inadvertently disobeyed the choreography by walking around the stage, when it was planned that he would stay still, and was chastised by the band manager after the show: "The mistake was such a big deal that from that moment on, never again did I move when I wasn't supposed to move. That was the discipline of Menudo: You either did things the way you were told or you were not part of the group." The song "Asignatura Pendiente" from "Almas del Silencio" (2003) was inspired by the first time Martin left Puerto Rico to tour with Menudo.