Mariusz Kozieł is a Polish organist and composer based in Breda, the Netherlands. Since September 2025, he has been Junior Organist-in-Residence at Pieterskerk in Leiden. His artistic activities encompass solo performance, chamber music, improvisation and composition, with a repertoire ranging from early music to contemporary works. He has performed at prestigious venues including Southwark Cathedral in London, NOSPR in Katowice, Laurenskerk and De Doelen in Rotterdam. An active composer, he creates works for organ, piano and chamber ensembles, seeking to develop a distinctive musical language and bring his own artistic expression to the concert stage.

My artistic work is built around three closely connected areas: organ performance, improvisation and composition. Each offers a different way of exploring the instrument and expressing musical ideas, while together they form the foundation of my artistic identity.

Performance & Repertoire

My repertoire encompasses music from different periods, from early music and the Baroque tradition to Romantic, twentieth-century and contemporary works. I am particularly interested in the expressive possibilities of different historical and modern instruments, and in finding an individual approach to each instrument and its musical context.

Alongside established repertoire, I place great importance on performing new music, especially my own compositions. I believe that every interpretation should offer a personal perspective, allowing the performer to communicate something unique through the music.

Improvisation

Improvisation is an essential part of my musical life. It allows me to explore the organ beyond the boundaries of written repertoire, experiment with its colours and textures, and develop musical ideas in the moment. My approach to improvisation is rooted in a fascination with musical form, harmony and the expressive possibilities of the instrument.

Composition

Composition has become an increasingly important part of my artistic activity. I regularly write for solo organ, piano and chamber ensembles, exploring different musical forms and searching for a personal musical language.

For me, composing is a deeply personal process: a way of expressing ideas and emotions that might otherwise remain unheard. I am particularly interested in bringing my works to the concert stage, allowing audiences to encounter music that is both new and genuinely personal.

Artistic Vision

Whether performing established repertoire, improvising or presenting my own compositions, I aim to offer audiences an individual artistic experience. I believe that music becomes most meaningful when it carries something personal – a distinctive perspective, an authentic expression and a connection between the performer and the listener.

• Southwark Cathedral – London, United Kingdom (2026)
  Organ recital; UK premieres of Three Organ Pieces op. 1 no. 1 & 3.
• St George’s Hanover Square – London, United Kingdom (2026)
  Organ recital; UK premieres of Three Organ Pieces op. 1 no. 2.
• Laurenskerk – Rotterdam, The Netherlands (2025, 2026)
  Premiere of Podhale Fantasia op. 4, performance of M. Duruflé’s Prélude, Adagio et Choral Varié on „Veni Creator” op. 4
• National Polish Radio Symphony Orchestra Concert Hall (NOSPR) – Katowice, Poland (2023)
  Solo organ performance and performance of K. Penderecki’s Die schwarze Maske with orchestra with Marin Alsop.
• Silesian Philharmonic – Katowice, Poland (2017)
  Soloist with the Silesian Philharmonic Orchestra, performing the third movement of Organ Concerto, Op. 52.