Constante José Aguer, born on April 6, 1918, in the Mataderos neighborhood of Buenos Aires, Argentina, was a multifaceted artist known for his contributions as a singer, guitarist, poet, writer, journalist, and composer. He passed away on July 31, 2010, in Buenos Aires.

Aguer's artistic journey began in his youth, studying music and performing as a guitarist and singer alongside Marcos Herminio Ramírez on the "Teatro Autóctono" radio program broadcasted by Radio Municipal and Radio Fénix. In 1938, he joined the "Trío Típico de Emilio Chamorro" as a singer and guitarist, performing for several years on Radio Stentor. He later formed his own group, performing in radio stations and dance halls, and began recording in 1938 with Odeón and RCA Víctor, focusing on the Correntino songbook.

As a prolific composer, Aguer registered over 200 works, including the renowned "Kilómetro 11," with music by Tránsito Cocomarola, which became an emblematic chamamé piece. His literary contributions include books such as "Mis cantares al Taragüí," "La Biblia en la selva guaraní," and "El chamamé en Buenos Aires, su historia, mis memorias." He published bilingual poems in various magazines and participated in literary workshops and cultural programs.

Aguer's influence extended to radio, where he produced and hosted programs like "Taraguí Coé - Amanecer correntino" on Radio Nacional and "Por los caminos del chamamé" on the Cadena Argentina de Radiodifusión. In 2004, he was recognized as a Distinguished Personality of the City of Buenos Aires, honoring his significant contributions to Argentine cultural heritage.