Home of the world-famous National Philharmonic Orchestra and Choir of Poland, the National Philharmonic was founded in 1901. Destroyed during WWII, it was rebuilt in 1955 to house a concert hall (enter from ul Sienkiewicza 10) and a chamber-music hall (enter from ul Moniuszki 5), both of which stage regular concerts.
There are box offices at both entrances. If you're travelling with kids, come along to one of the Sunday concerts for children.