[1] When Villa-Lobos travelled home to Brazil in June 1930 to fulfill some conducting engagements, it was his intention to return to Paris in a few months' time.

However, when the Revolution of 1930 brought Getúlio Vargas to power, it became impossible for a time to travel or make payments abroad.

[2] The composer published a verbal description of the entire work,[3] and another, unpublished document containing musical examples from both Chôros No.

The choirs employ mainly nonsense syllables as a text, in order to contribute a colouration of onomatopoeic sounds, using the voices as if they were instruments.

In addition, the voices at times "give the impression of quarter tones and a harmonious atmosphere with melodies in a sort of descant".