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After 1960 he put together his early groups to play at provincial radio stations and on television. His Octeto Guardia Nueva had such an impact that Astor Piazzolla, when he heard it during one of his tours, suggested that Mederos travel to Buenos Aires.
Later, Piazzolla returned to Córdoba and invited Mederos to appear in his recitals.
In 1965 Mederos traveled to Buenos Aires and cut his first record "Buenos Aires, al rojo" in which he played Cobián's and Piazzolla's pieces as well as his own compositions.
After spending two years abroad, first in Cuba and later in Paris, he returned to Argentina, and in 1969 he joined the new Osvaldo Pugliese orchestra, which was formed due to the decision of its former players who wanted to play only with the ensemble, Sexteto Tango, they had recently put together. He was in the bandoneon section with Arturo Penón, Daniel Binelli and Juan José Mosalini.
In 1976 he put together a new group, Generación Cero, that attracted a cult following. His appearance with his group was hardly conventional and perhaps irreverent. Its sound tried to achieve a fusion between jazz, rock and the music of Buenos Aires. It displayed far-fetched arrangements with impressionist reminiscences. It was an intentional rupture, a juvenile search that looked for a new road in music.
Although the group contained a bandoneon, and despite other similarities, their music was not a variant of the tango genre. Neither the "licks" nor the rhythm belonged to tango, and the arrangements modified the melody to the point of making it hardly recognizable. However, little by little they were reaching an intellectual sector, avid for innovations.
In 1976 the first LP was released, "Fuera de broma 8". It started a series of this never-conforming and audacious style. The subsequent albums were: "De todas maneras" (1977), "Todo hoy" (1978), "Buenas noches, Paula" (1983), "Verdades y mentiras" (1984) and "Reencuentros" (1989).
Despite their features, these works reached a widespread recognition, and Mederos' artistic personality was growing and achieving public acclaim, especially abroad.
Mederos began the 1990s with a solid position in the musical scene. He returned to the recording studios with a new series of CDs, in different settings:"Tanguazo" (1993), "Carlos Gardel" (1994), Mi Buenos Aires querido" with a trio that spotlighted the great pianist Daniel Barenboim (1995), "El día que Maradona conoció a Gardel" (1996), "El tanguero" (1998) and "Eterno Buenos Aires" (1999). In 2000 he continued his output with the record "Tango Mederos-Brizuela" and with another disc that included the soundtrack of the film "Las veredas de Saturno" that he had composed twenty years before.
In 1999 Mederos formed a quintet with the pianist Hernán Posetti, the violinist Damián Bolotín, the guitarist Armando de la Vega and the double-bassist Sergio Rivas. They recorded the above-mentioned disc "Eterno Buenos Aires".
Besides the soundtrack of the French-Argentine motion picture directed by Hugo Santiago (1986), Mederos composed the soundtracks, or part of them, of: Sergio Renán's "Crecer de golpe" (1976), Simón Feldman's "Memorias y Olvidos" (1987), Tristan Bauer's "Después de la tormenta" (1991), Jana Bokova's "Diario para un cuento" (1997), Jaime Chávarri's "Sus ojos se cerraron" (1998) and Bebé Kamin's "Contraluz" (2001).
Mederos' special ductility to blend different rhythms and genres with an air of tango can be evidenced by the series of recitals in which he has appeared, invited by folk, pop and rock musicians. Also, we can highlight his collaborations in recordings with Mercedes Sosa and Luis Alberto Spinetta, and recently with the Catalonian Joan Manuel Serrat in his disc titled "Cansiones." Mederos had played with the latter in 1994 in two numbers on the disc "Nadie es perfecto."
«Somewhere art must irritate and arouse suspicions. Art is authentic when it is not complacent.» «There is a kind of piazzollization that is smothering. His pieces (Piazzolla's) produce light, but they can dazzle.»
- http://www.rodolfomederos.com.ar/ [Official Site]