The text in the first section is by Mario de Andrade. The soprano merely hums in the second section.
The last section was arranged by Villa-Lobos for voice, violins & violas (W195).
Soprano and violin
Villa-Lobos, Heitor. 1923. Suite para canto e violino, Eschig, Paris, 1923.
Soprano Jill Gomez and violinist Peter Manning perform the Suite as a special bonus on the excellent CD The Pleeth Cello Octet play Villa-Lobos. It's excellent to have this important Hyperion disc re-released on the budget Helios label.
This is becoming a very popular work in concert; there are sixteen records in the Villa-Lobos Concerts database as of May 2011.