Formed in 2000, Sin Bandera are comprised of Leonel García and Noel Schajris; the former is from Mexico, the latter Argentina, and both are musicians, composers, and singers. Schajris had already released a solo album, in 1999, but when the two singer/songwriter/musicians befriended one another and realized how complementary they were to one another artistically, they joined together and began to work on songs for an album. García played guitar, Schajris played piano, and fellow musician Aureo Baqueiro assumed the role of producer, also contributing various instrumentation. The guys decided to bill themselves as Sin Bandera (Without a Flag) because of their mixed heritage as well as their belief in unity among diverse peoples.

They debuted with the song "Entra en Mi Vida," an expressive love song that was chosen to be the main theme of a Mexican telenovela, Cuando Seas Mía. Other singles followed, including "Kilómetros" and "Sirena." Released in early 2002, Sin Bandera steadily found international success, mainly in Mexico but also in Spain, Argentina, and the United States -- that is, all the major Latin markets -- in addition to smaller markets like Costa Rica. The album won that year's Latin Grammy for Best Pop Album by a Duo or Group with Vocal, and it also netted a standard Grammy nomination for Best Latin Pop Album. Other awards showered on the duo included an MTV Latino Award for Best Group and a Lo Nuestro Award for Best Pop Album.

Following this rash of breakout success, Sin Bandera returned to the studio quickly and recorded a follow-up album, De Viaje (2003), with Baqueiro again producing and playing a multitude of instruments. De Viaje sold even better than Sin Bandera had, and it featured the duo's first Hot Latin Tracks chart-topper, "Mientes Tan Bien." Other singles include "Que Lloro," a Top Five hit, and "De Viaje," which broke into the Top 20. This second round of success was topped off with another Latin Grammy win for Best Pop Album by a Duo or Group with Vocal. Also in 2003, Sin Bandera toured America and Spain in support of Spanish superstar Alejandro Sanz, who was on the road promoting No Es Lo Mismo (2003), another of the biggest Latin pop albums of the year. In 2004, they mounted a tour of their own, covering all of Latin America, even small markets like Bolivia and Paraguay.

For their third album, Mañana (2005), García and Schajris reached beyond Baqueiro, reeling in such collaborators as contemporary R&B producer Brian McKnight, arranger Bill Meyers, Latin rapper Vico C, and Italian pop superstar Laura Pausini. The result was their most stylistically diverse album yet, certainly their most urban -- not unlike No Es Lo Mismo in this regard, as that album had found Sanz toughening up his sound with urban flourishes. Mañana became their first album to break into the Billboard 200; it was also their first to break into the Top Five of the Top Latin Albums chart. "Suelta Mi Mano" was the biggest hit among the singles, with "Que Me Alcance la Vida" also charting well. Pasado (2006) followed soon afterward. An album of covers, Pasado showcases Sin Bandera reinterpreting songs by such well-known contemporary Latin pop influences as Sanz ("Lo Ves"), Ricardo Montaner ("Será"), Aleks Syntek ("Mis Impulsos Sobre Ti"), and Rosana ("Si Tu No Estas Aquí").

After a legnthy tour of Latin America, Sin Bandera decided to split in 2007 though it was amaicable. Both singers followed different solo paths. A second covers collection, Pasado Mañana was issued digitally in 2009 and the collection Personalidad in 2014. In mid 2015, Sin Bandera announced the renunion tour Una Ultima Vez. It began in December and lasted well into 2016 with almost all shows sold out. A live album and DVD were planned for future release. ~ Jason Birchmeier