After a fiery overture by Polish composer Grażyna Bacewicz, this concert centers on two of classical music’s greatest voices. While at its core an elegant and charming Classical-era composition, Beethoven’s second piano concerto includes delightful and innovative surprises that harken to his later Romantic roots. Rachmaninoff~s Symphony No. 2, on the other hand, is Romantic through and through. This orchestral masterwork is teeming with achingly beautiful melodies, luscious orchestral colors, and vivid emotions.