Arco Iris were a rock group from the late 60s until the late 70s in Argentina, and one of the most influential in Argentine rock history in more ways than just music. While tagged as an 'acoustic' Argentine rock band in the beginning, Arco Iris were pioneers (with Chilean band Los Jaivas), infusing rock with regional folk music, as well as one of the first bands that projected their beliefs through their music and lifestyle (in their case around the art of yoga). In the 1980s Arco Iris minus Santaolalla moved to the United States to live in the mountains of California, where they have been involved in the jazz-rock and new age music scene.
Arco Iris frontman Gustavo Santaolalla (right) would emerge in the 1980s as one of the artists and producers that popularized rock music beyond Argentina and aided the rise of Rock en Español (with Miguel Mateos, Charly Garcia, etc) by promoting rock acts all over Latin America ex-Argentina.
We are informed that all the members of the band were vegetarian,
source: personal acknowledgement, url: www.arcoirismusic.net