This spring, Swedish pianist Per Tengstrand returns to Scandinavia House for the Music on Park Avenue concert series and concludes his performances of Beethoven’s 32 piano sonatas.

This concert is devoted to the longest, most difficult of them all — the Hammerklavier was deemed unplayable and not performed in public until more than 50 years after his death. Nevertheless, Beethoven considered the Hammarklavier sonata the best he had composed.