Prestigious international festival of classical music, celebrated every year at the Palacio Euskalduna. During 4 days, numerous concerts are programmed around a common theme, dedicated to a particular composer or period. Over the years, the festival has featured Mozart, Vivaldi, Beethoven, Schubert and Chopin, among many other composers.

In addition to its concert programme, the festival also offers lectures and exchanges with musicians, as well as workshops for children and concerts for families.