…a multihued account of Rachmaninoff’s ‘Rhapsody’…von Oeyen dashed off the knotty passages in the “Rhapsody” with elegance, crisply evoking Paganini’s legendary left-hand pizzicato in Variation 19. He also showed touching moderation in the score’s famously swooning tune in Variation 18. Nothing schmaltzy — just the music, please.