Birabent relocated to seaside Villa Gesell in early 1966 and opened the Juan Sebastián Bar, where he formed Los Beatniks.

With his wife, Inés, and two children to look after, however, Birabent signed on as a soloist with Mandioca Records in 1969, and the following year, released 30 minutos de vida (30 Minutes in the Life).

His second album, Ciudad de guitarras callejeras (City of Street Guitars, 1973) was a departure from his earlier, folk rock style, and drew more from the Argentine tango.

There, he recorded Fiebre de Vivir (A Fever for Living), whose 1979 release included his version of Carl Perkins' rockabilly standard, Blue Suede Shoes, and his hit single, Sábado a la noche (Saturday Night).

His 1995 release, Sur y después (South, and then), was notable for its being recorded in Buenos Aires and performed in the Cervantes Theatre with the Argentine National Symphony Orchestra.