More than 25 years after his dramatic career breakthrough with the CSO at Ravinia, Lang Lang is one of classical music’s most celebrated ambassadors. In this thrilling trio of programs, the superstar pianist traverses all five of Beethoven’s groundbreaking piano concertos. Joining Paavo Järvi and the CSO, Lang Lang opens the week with the First Piano Concerto — the daring twists of which pushed the limits of Classical convention — and the searching and sublime Fourth Piano Concerto.