Matthias Pinscher, who led the Cleveland Orchestra in February of last year and is a former Daniel R. Lewis Young Composer Fellow, will conduct the orchestra tonight as it presents a program of Ravel. Special guest pianist Jean Yves Thibaudet is featured in a performance of Ravel's piano concert that was written for the left hand only. Performances take place at 7:30 tonight and at 8 tomorrow and Saturday night. Consult the website for ticket prices. (Niesel)