Amaia has sung in a variety of languages, including Basque, Spanish, Catalan, Italian, French and English.

[1] She also wrote some of the most successful singles of the band on their original versions, including "Mariposa" (2000) and "Puedes Contar Conmigo" (2003) among many others.

She attended UPV/EHU studying Chemistry, where she met the rest of the members of La Oreja de Van Gogh.

She has a vocal instructor, and even though she cannot attend classes regularly due to lack of time, the benefit to her voice is evident.

"La Oreja de Van Gogh" was formed in 1996, after guitarist Pablo Benegas, bassist Álvaro Fuentes, keyboardist Xabi San Martín, and drummer Haritz Garde met at a local university.

It became the 45th best-selling album of all time in Spain, while the band continued to break into the Latin American markets, including the States.

More concerts in Mexico and South America followed in 2005 including a sold-out concert at Luna Park in Argentina, and two shows with crowds of over 30,000 each concert in Chile, where they received all possible audience acceptance awards when they performed at the 2005 Viña del Mar International Song Festival, taming the usually demanding crowd (traditionally called "El Monstruo", or "The Monster", because of their enthusiasm) and from there they travelled to Japan to play a sold-out show in Tokyo on 25 July 2005.

In 2006, Amaia Montero and La Oreja de Van Gogh, released their fourth and last work together called: Guapa.

In 2007, La Oreja de Van Gogh with Amaia as lead singer, became the 16th best-selling music artists of all time in Spain.

[6] La Oreja de Van Gogh remains active and has now released four studio albums with new lead singer Leire Martínez.

Movistar promoted her tour 2009 that continues in Peru, Ecuador, Panama, Costa Rica, Nicaragua, Mexico, Colombia, Venezuela, Uruguay, Argentina, Chile and Spain.

In 2012, she recorded a cover of "Moon River" in Catalan entitled "Riu de lluna", for the CD of TV3's telethon La Marató.