Sui Generis is one of the most influential rock bands in Argentine history, enjoying enormous success and popularity during the first half of the 1970s and a following that lasts to the present throughout South America. Its youthfull songs became hymns for successive generations of Argentinians and are classics at fireside sing-along gatherings. Sui Generis disbanded on September 5, 1975, and, despite concerts that took place in 1980 and 2001, a permanent re-formation has been ruled out.