This 1961 recording documents Prof. Werner Bürck's pioneering acoustic research into loudness perception and noise measurement—a subject that occupied German engineers and scientists during the post-war period as industrial and urban sound became an urgent concern. Rather than a conventional lecture, what you hear is an early venture into sonic documentation itself, where the spoken word, technical demonstrations, and experimental sound materials merge into something neither purely scientific nor purely musical. Bürck's methodical voice guides you through the physics and psychology of how we perceive volume, while the recording captures the texture of mid-century laboratory work—a document that exists at the intersection of engineering rigor and the emerging possibility of using audio itself as a medium for knowledge. For anyone interested in the forgotten histories of electronic sound, German industrial culture, or the boundary between science and experimental practice, this is genuinely compelling listening.