As well as the works already mentioned, his compositions include four operas, eight symphonies and other orchestral pieces, a variety of instrumental concertos, choral settings of mainly religious texts, as well as chamber and instrumental works.
Fluorescences followed a year later; it increases the orchestral density with more wind and brass, and an enormous percussion section of 32 instruments for six players including a Mexican güiro, typewriters, gongs and other unusual instruments. The piece was composed for the Donaueschingen Festival of contemporary music of 1962, and its performance was regarded as provocative and controversial. Penderecki's intentions at this stage were quite Cagean: 'All I'm interested in is liberating sound beyond all tradition'. This preoccupation with sound culminated in De Natura Sonoris I, which frequently calls upon the orchestra to use non-standard playing techniques to produce original sounds and colours. A sequel, De Natura Sonoris II, was composed in 1971: with its more limited orchestra, it incorporates more elements of post-Romanticism than its predecessor. This foreshadowed Penderecki's renunciation of the avant-garde in the mid-1970s, although both pieces feature dramatic glissandos, dense clusters, and a use of harmonics, and unusual instruments (the musical saw features in the second piece).
The large-scale St. Luke Passion (1963–66) brought Penderecki further popular acclaim, not least because it was devoutly religious, yet written in an avant-garde musical language, composed within Communist Eastern Europe. Western audiences saw it as a snub to the Soviet authorities. Various different musical styles can be seen in the piece. The experimental textures, such as were seen in the Threnody, are balanced by the work's Baroque form and the occasional use of more traditional harmonic and melodic writing. Penderecki makes use of serialism in this piece, and one of the tone rows he uses includes the BACH motif, which acts as a bridge between the conventional and more experimental elements. The Stabat Mater section towards the end of the piece concludes on a simple major chord of D major, and this gesture is repeated at the very end of the work, which finishes on a triumphant E major chord. These are the only tonal harmonies in the work, and both come as a surprise to the listener; Penderecki's use of tonal triads such as these remains a controversial aspect of the work.
Penderecki continued to write pieces that explored the sacred in music. In the early 1970s he wrote a Dies Irae, a version of the Magnificat, and Canticum Canticorum, a song of songs for chorus and orchestra.
Around the mid-1970s, while he was a professor at the Yale School of Music Penderecki's style began to change. The Violin Concerto No. 1 largely leaves behind the dense tone clusters with which he had been associated, and instead focuses on two melodic intervals: the semitone and the tritone. Some commentators[who?] compared this new direction to Anton Bruckner. This direction continued with the Symphony No. 2, Christmas (1980), which is harmonically and melodically quite straightforward. It makes frequent use of the tune of the Christmas carolSilent Night.
Penderecki explained this shift by stating that he had come to feel that the experimentation of the avant-garde had gone too far from the expressive, non-formal qualities of Western music: 'The avant-garde gave one an illusion of universalism. The musical world of Stockhausen, Nono, Boulez and Cage was for us, the young - hemmed in by the aesthetics of socialist realism, then the official canon in our country - a liberation...I was quick to realise however, that this novelty, this experimentation and formal speculation, is more destructive than constructive; I realised the Utopian quality of its Promethean tone'. Penderecki concluded that he was 'saved from the avant-garde snare of formalism by a return to tradition'.
In 1980, Penderecki was commissioned by Solidarity to compose a piece to accompany the unveiling of a statue at the Gdańsk shipyards to commemorate those killed in anti-government riots there in 1970. Penderecki responded with Lacrimosa, which he later expanded into one of the best known works of his later period, the Polish Requiem (1980–84, 1993, 2005). Again the harmonies are rich, although there are moments which recall his work in the 1960s. In recent years, he has tended towards more traditionally conceived tonal constructs, as heard in works like the Cello Concerto No. 2 and the Credo. He conducted Credo on the occasion of the 70th birthday of Helmuth Rilling, 29 May 2003. In celebration of his 75th birthday he conducted three of his works at the Rheingau Musik Festival in 2008, among them Ciaccona from the Polish Requiem.
In 2001, Penderecki's Credo received the Grammy Award for best choral performance for the world-premiere recording made by the Oregon Bach Festival, which commissioned the piece. The same year, Penderecki was awarded with the Prince of Asturias Prize in Spain, one of the highest honours given in Spain to individuals, entities, organizations or others from around the world who make notable achievements in the sciences, arts, humanities, or public affairs. Invited by Walter Fink, he was the eleventh composer featured in the annual Komponistenporträt of the Rheingau Musik Festival in 2001. Penderecki received an honorary doctorate from the Seoul National University, Korea in 2005, as well as from the University of Münster, Germany in 2006. His notable students include Chester Biscardi and Walter Mays.
Penderecki has three children, a daughter from his first marriage, and a son and daughter with his current wife, Ezbieta Solecka, whom he married in 1965.