Born in 1981, composer, guitarist and sound engineer. He graduated from the composition class of Zygmunt Krauze and the sound  engineering class of Andrzej Lupa at the Chopin University of  Music in Warsaw. He is the director of the Chopin University’s  Electronic Music Studio and a member of the Creative Group that  develops Warsaw’s Hashtag Lab – Contemporary Music Space.

His works have been performed by ensembles and orchestras  such as Klangforum Wien, Musikfabrik, London Sinfonietta,  Polish Radio Orchestra, United Instruments of Lucilin (Luxembourg), Gorzów Philharmonic, Wratislavia Chamber Orchestra,  Spółdzielnia Muzyczna, and Hashtag Ensemble.

He has won prizes at several competitions for composers, including the International Confederation of Electroacoustic Music’s  Prix CIME for #NetworkMusic (2019), 1st Krzysztof Penderecki  International Composers’ Competition Arboretum (3rd Prize,  2012), and 52nd Tadeusz Baird Competition for Young Composers (1st Prize, 2011). He took part in IRCAM Forum Workshops in Paris. He has released five monographic albums: Re-Used  Sounds (Ośrodek Rozdroża, 2026), Music of Strings (Chopin University Press, 2022; Fryderyk Award for Contemporary Music  Album of the Year), General Theory of Relativity (2021, Kairos),  Thrash Music (Requiem Records, 2018), and Loopovisations  (2013, For Tune), as well as several CDs of improvised music  performed with Hashtag Ensemble and The Intuition Orchestra. Błażejczyk writes acoustic and electroacoustic music: orchestral,  chamber, theatre and film works. He has composed the music  for over a dozen documentaries, several dozen theatre productions, and a computer game. He specialises in the live processing of sound from acoustic instruments and sound-producing  objects. He also constructs objectophones (musical instruments  constructed out of everyday objects, whose sound is transformed  live) and has authored the gesturophone (an electronic device  controlled by gestures), as well as atypical string instruments  (zithers, the valiha and bandura).

Selected works (since 2013): LoPassHiCut for double bass  and live electronics (2013), Guitar Sculptures for electric guitar  and live electronics (2013), Bethlehem for choir, soprano, baritone, duduk, percussion, organ and electronics (2013), A Concise History of the Death of Jean Calas for baritone, choir and  symphony orchestra (2014), Trash Music for ensemble, voice  and objectophones (2014), Particle Horizon for electric guitar,  bass guitar, objectophones and live electronics (2014), Warsaw  Music for instrumental ensemble, voice and live electronics  (2015), Music of Strings for electric guitar, piano and string trio  (2015), Concerto for electric guitar and string orchestra (2016),  Spirits of the Dead for flute, violin and viola (2016), DATA Selfie  for three performers and electronics (2017), Angels of Peace for  oboe, clarinet, horn and double bass (2017), #NetworkMusic for  voice, chamber ensemble and electronics (2017), String Theory  for 11 Harry Partch string instruments (2017), Concerto for  viola, clarinet, electronics and string orchestra (2018), Étude  semi-concrète. Study for Many Strokes on Different Objects for  electric guitar, objectophones and electronics (2019), Gesturophony for gesturophone (2019), Aether for flute, clarinet, trumpet, violin, cello, double bass and electronics (2020), Shine for  actor, chamber ensemble and electronics (2020), Stringphonies,  a cycle for untypical string instruments (2020–22), Co-Relations  for voice and gesturophone (2021), The Bunker. Fake Opera for  four performers, chamber ensemble and electronics (2020–21),  The Science of Destruction for electric guitar (2022), Postquartet for string quartet (2022), Liturgy of the Object for symphony  orchestra, choir and objectophones (2023), 1-Day Challenge for  three performers and electronics (2024), The Basilisk, the Witch  and the Band, electronic miniature (2024), Soundbank of Modern Human for ensemble and electronics (2024), Re-Used Sounds  for objectophones and electronics (2025), String Quartet no. 3  (2025), Extent for performer, motion sensors and electronics  (2025), Iqa’at for violin, cello and piano (2025), Garden of Memory for actor, ensemble and children’s choir (2025), Współczulność  (Sympatheticality) for viola d’amore and ensemble (2026).

An active concert guitarist, he plays new music on the electric  guitar and with live electronics. He is a member of Hashtag  Ensemble and has performed improvised music with ensembles  such as Mud Cavaliers and Elektronisches Glück, artists such  as Adam Pierończyk, Agata Zubel, Krzysztof Knittel, and Joëlle  Léandre.