Gianneo’s music can be divided into four periods. The first, 1913–1923, shows the influence of European romantic and impressionist composers. The second, from 1923–1932, sees the introduction of folk elements into his music. The third period, from 1933 to 1953, is characterized by the combination of folk-music and neo-classicism, resulting in a style of simplicity and economy. The fourth and final period, from 1954 to his death in 1968, involved the emergence of a disciplined use of dodecaphonic compositional principles. Sonata No. 2 and Suite are among Gianneo’s most ambitious works, with folk elements well to the fore. Sonatina, completed in Paris, is highly neo-classical. Sonata No. 3 is considerably harsher in style, perhaps reflecting the composer’s sorrow at the death of his wife in 1955. The Six Bagatelles, composed between 1957 and 1959, possess only hints of musical nationalism, while the Improvisación is a nostalgic evocation of the city of Tucumán.