Although "Musique funèbre" was internationally acclaimed, his new harmonic techniques led to something of a crisis for Lutosławski, during which he still could not see how to express his musical ideas. Then on 16 March 1960, listening to Polish Radio broadcast on new music, he happened to hear John Cage's "Concert for Piano and Orchestra". Although he was not influenced by the sound or the philosophy of the music, Cage's explorations of indeterminacy set off a train of thought which resulted in Lutosławski finding a way to retain the harmonic structures he wanted while introducing the freedom for which he was searching. His "Three Postludes" were hastily rounded off (he had intended to write four) and he moved on to compose works in which he explored these new ideas.