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Mexican musician Julián Carrillo (1875-1965) is an important link of musical theory and futurism in music, which is being studied more intensively in the last two decades, so there is still no full appreciation of his works. 

According to Wikipedia, Carrillo was an important pioneer of microtonality, music that uses intervals smaller than a semitone (microtones). In traditional Western music, an octave is divided into 12 equal semitones. In microtonality more notes are used, called microtones. 

Carrillo's creations were known and performed in Ecuador and Cuba, and he had the support of the main musical institutes of France, Argentina, Brazil and Mexico for the Sibelius prize in Finland, which he won, but died before he could receive it.

Six handwritten autograph scores of this Mexican musician are nominated, produced between 1905 and 1910, which correspond to his interests in musical creation and education. They are important and rare vestiges of a time of research and experimentation of who later created the theory of Sound 13, the first attempt to formalize the systematic study of microtonality.