Known in the first place as a composer, music theoretician, playwright and graphic artist, Boguslaw Schaeffer holds quite a separate and unique position amongst his peer artists. This article puts an emphasis on the main traits of Schaeffer's 'aesthetics of the borderline', and traces the evolution of thought and various activities of this 'interdisciplinary artist' across the latter half of 20th century. The focus is on hybrid forms, overcoming the borders of, primarily, music and theatre (a 'new music'/'new theatre'), as well as the complex reception of works by the author of 'Quartet for four actors'. His ingenious understanding of music and of the phenomenon of contemporary score has led him, ever since his earliest works, to committing subsequent musical experiments, such as e.g. the concept of instrumental theatre, which, as a consequence, become decisive as to the specific form of stage plays written by this dramatist and composer.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
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