Related Information for Grupo Mania Grupo Mania (sometimes spelled Grupomanía or Grupo Manía) is a popular merengue group from Puerto Rico that released its debut album in 1993. The group was formed by brothers Héctor, Edwin and Oscar Serrano together with Alfred Cotto in the early 90s. In 1994, Edwin Serrano was replaced by Elvis Crespo before releasing their most successful albums.In 1997, Crespo decided to leave the group and follow a solo career. He was replaced in 1998 with Reynaldo Santiago, who had previously sung.. read more