Harpsichordist Mahan Esfahani's alternately rousing, bland birthday tribute to C.P.E. Bach

Mahan Esfahani came home Friday night, in a sense, to play a recital at the Library of Congress. The American harpsichordist, who grew up in Potomac, Md., offered a tribute to C.P.E. Bach, the son of J.S. Bach who was born 300 years ago last month. The program included only two sonatas by the birthday boy, paired with music by other members of his famous family and some unexpected choices, including a piece by Domenico Cimarosa as an encore.