Hi all !
At the site http://www.bue.gob.ar/audioguia/
there is a mobile audio guide
12 circuits to become acquainted with Buenos Aires history through the voices of their protagonists. Political speeches, testimonies of actors, dialogues of films.
Sounds and music which may allow to reconstruct past events of Buenos Aires history and thus obtain information on key points of the city.
You can listen to them in english or spanish.
I've choosen some of them, you can find more at the site.