Composer, sound engineer, guitarist. He is a graduate of the Chopin University of Music in the field of sound engineering and composition (in the class of Zygmunt Krauze). In 2016, he defended his doctorate in the discipline of musical arts. He is an assistant professor at the Chair of Composition of the Department of Composition and Theory of Music of the Chopin University of Music and head of the Chopin University Electronic Music Studio. Member of Hashtag Ensemble and creative group of Hashtag Lab – Space for Contempoarary Music.

He composes both electroacoustic music and music without the use of electronics. He specializes in live sound processing of acoustic instruments and sound objects. He is the creator of objectophones – instruments made of everyday objects whose sound is processed live – and of gestophone – an electronic instrument where the performer uses gestures to control sound parameters. He composes also theatre and film music. Błażejczyk performes new music at electric guitar and as live electronics performer, mostly with Hashtag Ensemble. He plays also zithers, dulcimer and other ethnic string instruments. He works as sound engineer and sound designer.