This book provides a thorough analysis focused on the sound expression produced by human-crafted musical instrument – a pipe organ, in which various components blend into a complex whole to produce a wide range of timbres. The sound produced by wooden and metal pipes of a variety of sizes is an integral part of the instrument unique character, while the organ stop is like its signature, from which one can judge about the size and style of the instrument, an organ building school or even an organ master, to which it is attributable. Precise identification of the name of the stop in accordance to both the pipework itself and the authentic inscriptions on the pipes is instrumental in investigating the geographic origins and authorship of an organ.  The monograph focuses on the craftsmanship of complex and historically influential organ stop Vox humana. Its research and definition provides specific information distinguishing particular features in the variety of organ building traditions and discussing the differences in organ sound perception and production. The volume is aimed at art and music historians, as well as musicologists and scholars researching restoration techniques. The book contains supplemental material with video and audio material as well as photo-documentation of authentic Vox humana examples. The material is placed in the online catalog, which may be accessed by scanning the QR code in the appendix of the book. dsgdsgds