Russian fortepianist Olga Pashchenko has had teachers on both the Russian (Alexei Lubimov) and the Western (Richard Egarr) sides, and she might be the one to put these ingredients together into a mix that makes a historical-instrument star. Here she plays a Christopher Clarke copy of a Viennese Fritz fortepiano of 1818, not exactly contemporaneous with the music involved, but close to it and just a little bit clearer sonically. The music is early-to-middle Beethoven, with the central slots occupied by two large variation sets that exemplify the fearlessly experimental streak of the young Beethoven. The more familiar of the two is the set called here by the name Prometheus Variations, Op. 35, but better known as the Eroica Variations because the theme is the same as that used in the finale of the Symphony No. 3 in E flat major, Op. 55 (“Eroica”). Pashchenko exploits her instrument’s chunky, big lower register well here as the theme builds innovatively out of its bass line at the beginning. Even more striking are the 32 Variations on an Original Theme in C minor, WoO 80, issued in 1808, where Beethoven seems to begin the groundbreaking experiments with Baroque style that would characterize his later years. The variations are very brief, almost like those in a Baroque chaconne, and here again Pashchenko fills out the texture with tough, knotty details. It’s an exciting performance of an important work that is primarily ignored because it was never published. Pashchenko also offers performances of the Fantasia in G minor, Op. 77, and the two “easy” sonatas of Op. 49, which in Pashchenko’s hands are not so easy. Exciting, serious Beethoven in which listeners will forget they are listening to a historical instrument.