Juan Maglio, also known as “Pacho”, was a popular bandoneonista, director and composer of the guardia vieja. He was among the first tango musicians to adopt the bandoneon along with Eduardo Arolas, Vicente Greco and Arturo Bernstein. He contributed to popularize tango in Buenos Aires cafes in the 1910’s and composed many titles still present in today’s repertoire.
Juan Felix Maglio was born in Palermo in 1880 to a family of Italian immigrants. Together they moved to Boedo when he was 12-years-old. His father Pantaleón owned a concertina and used to perform in cafes in the neigbourhood and this is how Pacho first came in contact with tango.
After completing primary school Juan Maglio studied to become a mechanic and began learning to play the bandoneon on his spare time. He studied with Domingo Santa Cruz and eventually made a decision to dedicate himself to music.
In 1899 Juan Maglio began performing at the cafe El Vasco en Barracas and other cafes in the neighborhoods of San Telmo and Palermo.  By 1910 he was well known in the city and with his cuarteto he began to play at the cafe La Paloma and other cafes along avenida Corrientes. In 1912 he began recording for Columbia and his discs were so popular that a special label was created for him with his picture and signature. The other members of his cuarteto at that time were Luciano Rios (guitar), Carlos “Hernani” Macchi (flute) and Jose “Pepino” Bonano (violin).
His first composition was “El zurdo” followed shortly after by “Armenonville”. Other compositions by Juan Maglio Pacho include “La pareja”, “Margot”, “Sabedo ingles”, “Un copetin” and “Toma mate”.
With all his success Juan Maglio was eventually in a position to buy the cafe Ambos mundos where he used to play. He also invested in his recording company but lost everything during the war. Having lost his fortune he went on performing in cafes, carnivals, theaters and on the radio for the rest of his life.  In the 1920’s he created a sexteto where 15-year-old Anibal Troilo made his debut. He also founded a trio of bandoneon with Jose and Luis Servidio. Some of his work was signed with the pseudonym Oglima.
Juan Maglio continued performing tango in an old fashion manner until the end of his career. He died in 1934 leaving almost 900 recordings. π
 Tango: Cien anos de historia (Vol. II). Buenos Aires: Editorial Perfil, 1992. Print.
 Pesce, Ruben, Oscar del Priore, and Silvestre Byron. La historia del tango: La guardia vieja. Buenos Aires: Corregidor, 1977. Print.
 Gobello, Jose. Mujeres y hombres que hicieron el tango. Buenos Aires: Centro editor de Cultura Argentina, 2002. Print.