Assobio a Játo, or “The Jet Whistle,” is a piece for flute and cello by Brazilian composer Heitor Villa-Lobos. The piece is inspired by the sound of a local engine, which Villa-Lobos imitates with a variety of extended techniques on the flute. The music is characterized by its angular melodies, complex rhythms and striking harmonies. The piece is a virtuosic tour de force for both the flute and cello, and it showcases Villa-Lobos' innovative and imaginative musical style.