After this summer’s “Un Ballo in Maschera,” the forces behind the Dutch label Pentatone are turning their attention to another heavy-hitter from the Italian repertoire: with “Tosca” they enter the well-trodden territory of one of the most recorded operas ever. Yet, Carlo Montanaro and the Rundfunk-Sinfonieorchester do not pretend to proverbially reinvent the wheel the way Rostropovich famously did in {…}