Gurrufío for flute orchestra was composed in 1998, commissioned by the Caracas Flute Orchestra and premiered in 1999 in Caracas.
The Gurrufío is a simple toy made of a flattened bottle cap, perforated with two holes and placed on a string loop. The cap spins back and forth as the wound string is pulled by both hands, opening and closing, tensioning and releasing. When the bottle cap spins, the friction with the air makes it sing. The rougher the edges, the louder the sound. The flute whistle-effect in the piece is an imitation of the Gurrufío's short whistle-burst sound.
The poly-rhythmic textures of the piece are inspired by Venezuelan music genres.