Los Gatos was an Argentine rock band, often cited as founding members of Spanish-language rock in the late 60s. In 1967, they released their first single, the double A-side "Ayer Nomás"/"La Balsa", which became a surprise hit, selling over 200,000 copies. Their self-titled, full-lenght debut album was released later that same year. After a touring the Southern Cone in 1968, Los Gatos released their second LP, "Seremos Amigos" featuring a psychedelic rock sound.