Eduard Franck’s two Violoncello Sonatas opp. 6 and 42 were published in 1843 and 1882, respectively, thus, almost 40 years apart. Although no authentic manuscripts sources are extant, the sonatas were likely composed fairly close to the years of their publication.

That for decades Eduard Franck was reluctant to publish some of his works is well known; this then led him, only a few years before his death, to pour out a cornucopia of new compositions, some of them composed decades earlier. With...