In 2003, Jesús Navarro and Julio Ramirez started their then-nascent musical project, tentatively called "Reik". It was then they recorded their first demos, which were released through the Mexican underground club scene. Two of the most successful demos — "Levemente" and "Ahora Sin Ti" — brought more widespread coverage across Mexico. In early 2004, Reik invited Gilberto to join the band. They have been famous ever since, mainly in Latin America, Mexico, and southern parts of the United States. Their videos have been broadcast on famous music television channels, such as MTV and HTV. Their second album, Secuencia, was released on November 14, 2006, which featured the first single, "Invierno" (released on November 6), which gained a lot of popularity based Latin American airplay. In September 2008 Reik released their third studio album Un Día Más.
By mid-2004 Reik started to get the attention of various major record companies, including Sony Music which eventually signed the band. In February 2005 Reik released their self-titled debut album, produced by Kiko Cibrian. The first single "Yo Quisiera" got heavy rotation on Mexican pop radio stations and soon went to number one. Their second single "Que Vida La Mia|Qué Vida La Mía" also topped the Mexican charts as did their third single "Noviembre Sin Ti". Their fourth single, "Niña", failed to match the success of their previous singles, charting only at #33.
Reik's debut album went gold in Mexico on May 6th, 2005 after selling 50,000 copies. In June 2005, Reik traveled to the U.S. to promote their album and its first single. They had a promotional mini-tour that visited Miami, McAllen, San Antonio, Houston, Dallas, San Juan (Puerto Rico), and New York. The album was formally released in the United States on May of that same year. To date, the album has sold 40,000 copies in the U.S. alone. By May, the album was certified platinum in Mexico for selling 120,000 copies. They have sold over half a million copies all over America to date. On July 6, 2007, Reik participated in the Alltel Wireless “Mi Círculo, Mi Música” (My Circle, My Music) concert in El Paso, TX.
Reik has been nominated to the Latin Grammy in the category "Best New Artist". They have been nominated to "Premios Lo Nuestro", "Premios Juventud", and numerous other awards. The band also has 4 nominations to the MTV Video Music Awards Latin America in the categories of "Best Pop Artist", "Best Group", "Best Northern Region Artist", and "Best Northern Region New Artist", winning three out of four. They also won "Mejor Cancion Latina Del Ano" at the Premios Orgullosamente Latino 2009.