For young pianists, it could be tempting to build an international career on Chopin alone. After all, the unequivocal “Poet of the Piano” wrote almost exclusively for the instrument, and left us with some 20 hours of poetic, if often nationalistic, piano music. As the gold medalist at the prestigious Frédéric Chopin Piano Competition in 2005, Rafal Blechacz is among the select few who evidently were chosen to carry Chopin’s torch to an international audience.