Fuga Dupla (1954) was discovered as a pencil sketch during the academic research of pianist Antonio Eduardo in 1997. It is an exercise in fugue that incorporates sonic and harmonic gestures inherited from Prokofiev and Paul Hindemith.

The two subjects, seemingly following the same path, suggest a free atonalism. It is indeed the music of a composer who plays with a fugue form, but free of its classical canons. “Something like a Fugue of free expression”, as the composer Gil Nuno Vaz wrote.