Regarded as one of the best pianists in the world, Jean-Yves Thibaudet joins the Cleveland Orchestra tonight at 7:30 at Severance Hall to premiere Scottish composer James MacMillan's "Piano Concerto No. 3: The Mysteries of Light," a piece which takes its inspiration from a set of reflections on the rosary introduced by Pope John Paul II. The orchestra will also play pieces by Higdon, Debussy and Scriabin. Guest speaker Caroline Oltmanns, a Youngstown State University professor, will give the pre-concert talk that takes place an hour before the concert. Performances continue through Saturday. Consult the Cleveland Orchestra website for more info. (Niesel)