This book presents sixteen chapters in Volume 1. This Volume I of the Proceedings of the Worldwide Music Conference 2021 offers a smorgasbord of scientific approaches to music. The congress is one of a kind; it is dedicated not to a specific field but to the interdisciplinary developments and the interaction with the representatives from actual scientific disciplines. The languages of mathematics, computer science, semiotics, palaeography, and medicine are in the mix; geography of the studies is also impressive-Greece, Mexico, China, Russia, India, Poland, and USA, to name just a few. The purpose of such juxtaposition is to see how the terminology, categorical apparatus, and interpretations of music vary from science to science and how this can enrich the terminology of music theory. They cover a wide range of topics that the editors divided into four subfields: music in interdisciplinary contexts, music and current technology, musical instruments and voice, and music pedagogy and medicine. The opening section of the Proceedings is thus dedicated to the idea of interdisciplinarity, relationship of creator of theory of harmony Rameau to sciences of his time, the idea of number in music, co-creation, and the category of musical network. Three more chapters here deal with Russian palaeography, Indian musical genre, and the idea of musical semiotics. It is a kind of opening statement from music theorists. Part two, music and current technology, united three chapters, on 'zero gravity' concept in modern music, discussion of scales as mathematical networks, and the innovation in digital music making, transforming it from stationary to mobile applications. The third part, musical instruments and voice, is of special interest because it is in the study of the instruments, the design, acoustic characteristics, and tuning, and sciences have cooperated with music theory for centuries. In addition to instruments, one chapter here is dedicated to voice. The last part, musical pedagogy and medicine, takes the reader even further into the interdisciplinary domain. The Proceedings is written in standard English language, prepared for the pleasure of reading of wide circles of professionals in different fields. The purpose of the editors is to bring this rather diverse set of texts into the context of a fruitful dialogue.

Ildar D. Khannanov is an assistant professor of music theory at Peabody Institute, Johns Hopkins University in Baltimore, USA. He is also a vice chair of the Scientific Committee of the Russian Society for Music Theory (OTM) and a member of EuroT@AM-Scientific Committee of the European Music Analysis Congress (EUROMAC). In such a position, Dr. Khannanov participated in organization of four congresses of the Russian Society for Music Theory, and, currently, he is a vice chair of the Organizing Committee of EUROMAC10. Dr. Khannanov is a student of Dr. Yuri Kholopov, and Dr. Pieter C. Van den Toorn. He studied philosophy with Professor Jacques Derrida at UC Irvine. Dr. Khannanov has published his research in the areas of postmodernist philosophy of music, musical semiotics, methodology of analysis of musical work, teaching of form, harmony, and folk music. He participated in more than 100 international conferences and published books and articles in English and Russian languages.
**Roman Ruditsa** is a composer, music theorist, inventor, and pianist. In 1995, he graduated from the Rimsky-Korsakov Saint Petersburg State Conservatory. He had an assistantship in the composition class of Professor S. Slonimsky, and a Ph.D. program in the musical analysis class of Dr. E. Ruchievskaya. He also studied piano and harpsichord in the class of E. Seredinskaya. Roman Ruditsa is a member of the St. Petersburg Union of Composers. He is an author of cantatas, chamber, and orchestra music. His musicological works are devoted to questions of analysis, harmony, and counterpoint. As a performing artist, his interests lie in the field of historical performance. With Andrey Bayadzhan, he invented The Musical Notation Keyboard that is patented by the US Patent and Trademark Office. Roman Ruditsa is a founder of D Notation company, which aims to create a perfect digital note typing tool, and the Worldwide Music Conference (WWMC).

Autorentext
Ildar D. Khannanov is an assistant professor of music theory at Peabody Institute, Johns Hopkins University in Baltimore, USA. He is also a vice chair of the Scientific Committee of the Russian Society for Music Theory (OTM) and a member of EuroT@AMScientific Committee of the European Music Analysis Congress (EUROMAC). In such a position, Dr. Khannanov participated in organization of four congresses of the Russian Society for Music Theory, and, currently, he is a vice chair of the Organizing Committee of EUROMAC10. Dr. Khannanov is a student of Dr. Yuri Kholopov, and Dr. Pieter C. Van den Toorn. He studied philosophy with Professor Jacques Derrida at UC Irvine. Dr. Khannanov has published his research in the areas of postmodernist philosophy of music, musical semiotics, methodology of analysis of musical work, teaching of form, harmony, and folk music. He participated in more than 100 international conferences and published books and articles in English and Russian languages.
**Roman Ruditsa** is a composer, music theorist, inventor, and pianist. In 1995, he graduated from the Rimsky-Korsakov Saint Petersburg State Conservatory. He had an assistantship in the composition class of Professor S. Slonimsky, and a Ph.D. program in the musical analysis class of Dr. E. Ruchievskaya. He also studied piano and harpsichord in the class of E. Seredinskaya. Roman Ruditsa is a member of the St. Petersburg Union of Composers. He is an author of cantatas, chamber, and orchestra music. His musicological works are devoted to questions of analysis, harmony, and counterpoint. As a performing artist, his interests lie in the field of historical performance. With Andrey Bayadzhan, he invented The Musical Notation Keyboard that is patented by the US Patent and Trademark Office. Roman Ruditsa is a founder of D Notation company, which aims to create a perfect digital note typing tool, and the Worldwide Music Conference (WWMC).