According to José Eduardo Martins, this quartet is a synthesis of his entire chamber production, with its musical texture being extremely pure.
[1] On this composition Oswald's wife Laudômia wrote in her diary: "The daddy's Quartet is modern, splendid, especially the Adagio (November 29).
[3] Composer Ernani Braga commented it: "One can't say which of the three movements of this quartet to admire more.
The inspiration flows clearly and spontaneously, as if it were coming from wonderful and inexhaustible ancient seas.
The Adagio opens with accompaniment chords, and it is only when the violin enters with its theme that the tonality is clarified to F minor.
The cyclic character and thematic unity of the entire composition is emphasized by the introduction of the first movement principal theme in its original form to the development section.