This all-French program features pianist Jean-Yves Thibaudet in Ravel's serious, single-movement Piano Concerto for the left hand. Closing the program is a work that's long been a staple of the BSO repertoire, Ravel's ballet score Daphnis et Chloé, a tourde- force of orchestral coloration and dramatic atmosphere the composer felt was one of his best works. Opening the program are Ravel's orchestrations of two contrasting Debussy piano pieces. These concerts mark the 90th anniversary of Ravel's conducting the BSO at Symphony Hall while visiting America in 1928.