Question: Who is che guevera’s friend who accompanies him in his road  trip by motorcycle as described  in a jorge drexlers song?
Related documents: [0]  [DOC] The Motorcycle Diaries (Spanish: "Diarios de motocicleta" ) is a 2004 biopic about the journey and written memoir of the 23-year-old Ernesto Guevara, who would several years later become internationally known as the iconic Marxist guerrilla commander and revolutionary Che Guevara. The film recounts the 1952 expedition, initially by motorcycle, across South America by Guevara and his friend Alberto Granado. As well as being a road movie, the film is a coming-of-age film; as the adventure, initially centered on youthful hedonism, unfolds, Guevara discovers himself transformed by his observations on the life of the impoverished indigenous peasantry. Through the characters they encounter on their continental trek, Guevara and Granado witness firsthand the injustices that the destitute face and are exposed to people and social classes they would have never encountered otherwise. To their surprise, the road presents to them both a genuine and captivating picture of Latin American identity. As a result, the trip also plants the initial seed of cognitive dissonance and radicalization within Guevara, who ostensibly would later view armed revolution as a way to challenge the continent's endemic economic inequalities and political repression. [END] 
[1]  [DOC] "Al otro lado del río" (English: On the Other Side of the River ) is a song, written and performed by Uruguayan singer Jorge Drexler for the film "The Motorcycle Diaries" (2004). Besides the film's soundtrack, it can also be found in Drexler's seventh album "Eco"; in the soundtrack the bassist Jeff Eckels also performed. [END] 
Answer: 
Alberto Granado
Alberto Granado