The sonata was performed together with Oswald's Piano Trio in B minor, Op.
45 at Salão do Jornal do Comércio (Rio de Janeiro) on 13 August 1916 by Alfredo Gomes (cello) and Joaquim Antonio Barrozo Netto [pt], on a concert given by the Trio Barrozo–Milano–Gomes.
[2] An article published in Jornal do Comércio said that Oswald decided to write a cello sonata after he heard Pablo Casals's playing and that this was only the first movement of a yet non-complete multi-movement sonata.
If it is so, then it must be claimed that the composer concluded later it was a satisfactory self-standing composition.
[1] The piece remained unpublished until 1982, when José Eduardo Martins made the first edition of it.