(Photo credit: Ismael Lorenzo) In the presence of Thomas Demenga, there’s no such thing as a solo concert, for one considers not only the unrepeatable coincidence of performer and instrument but also the composers whose creations bond them. Such fullness of vision was already evident in 1987, when the Swiss cellist began pairing J. S. Bach’s unaccompanied cello suites with contemporary counterparts in a flight of albums for ECM New Series. The first of these viewed the Suite No. 4 through a lens crafted of Heinz Holliger’s chamber pieces, thus setting precedent for a compelling traversal of deciduous and coniferous