Who did Luis Gianneo teach, who became considered a chief exponent of Argentine folk music?
Ariel Ramírez: Ariel Ramírez (4 September 1921 – 18 February 2010) was an Argentine composer, pianist and music director. Ariel Ramírez:  He was considered "a chief exponent of Argentine folk music" and noted for his "iconic" musical compositions.
i don't know