Luis Alberto Spinetta (23 January 1950 – 8 February 2012), nicknamed "El Flaco" (Spanish for "the skinny [one]"), was an Argentine singer, guitarist, composer and poet. One of the most influential rock musicians of Argentina, he is regarded as one of the founders of Argentine rock, considered the first incarnation of Spanish-language rock.[citation needed] Born in Buenos Aires in the residential neighbourhood of Belgrano, he was the founder of iconic rock bands including Almendra, Pescado Rabioso, Invisible, Spinetta Jade, and Spinetta y Los Socios del Desierto.