I begin this outline, dedicated to the music in Termopile polskie by Tadeusz Miciński, with a question regarding the author’s hearing, sensitivity and taste in music. I also consider the substantial importance of the playwright’s experience garnered from his sojourn in Leipzig and Dresden (e.g. fascination with Emil Jasques-Delcroze’s rhytmics and Adolphe Appia’s vision of theatre) in the use of music to create a modern mystery play. On the example of Termopile polskie. Misterium na tle życia i śmierci ks. Józefa Poniatowskiego I comment on the divergence between the spectacle’s musical layer and it’s storyline. I therefore seek to discover the proper place and character in the original dramatic con-cept. The article is completed with remarks concerning the use and importance of the musical component in creating a modern mystery play.