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Yuji Nagayo (stage name: TSUMUZI) is a Japanese composer and violinist. He founded Ernesto Cielo Records in 2013 and currently serves as its representative and musician. A science-trained violinist and licensed medical doctor, he was educated at Tokyo Medical and Dental University. Known as “Mr. 5 beats” and “Mr. Asymmetrical Meters” for his distinctive musicality, he is carving out his own unique musical style and worldview. He is from Gifu Prefecture.

Yuji Nagayo was born in Nagoya, Aichi Prefecture. Shortly after birth, he moved to Saitama Prefecture due to his father’s work as a hospital physician. Following his father’s establishment of his own medical practice, he grew up in Gifu City, Gifu Prefecture from the age of six. He began studying violin at the age of three and the piano at four. Until junior high school, however, he was primarily engaged in soccer and spent much of his youth as a sports-oriented student.

At the age of sixteen, while attending Taki High School, he listened to music composed by a classmate and felt that he might also be capable of composing music by himself. He sat at the piano and melodies naturally came to mind and resulted in completed music. This experience led him to immerse himself in songwriting and composition. Around his third year of high school, he first disclosed with his mother his desire to pursue a career in music; however, she strongly opposed the idea. After careful consideration, he decided to pursue admission to a medical school in Tokyo, believing that relocating to Tokyo might lead him down the path he wants to take, and began studying for the entrance examinations. Upon being accepted into the School of Medicine at Tokyo Medical and Dental University, he moved to Tokyo. From that point through graduation, he maintained a dual life, balancing his musical activities with his academic studies.

Around the age of twenty-one, while living in Yushima, Bunkyo Ward, he attended a gathering of a student circle at Tokyo University of the Arts due to its proximity. This experience led him to decide to create his own music using the violin, an instrument he had been familiar with since childhood, without limiting himself to classical music. Taking inspiration from Ernesto “Che” Guevara, a revolutionary who was also a physician, he formed the band 【ERNESTO CIELO】 and began his musical activities.

Around this time, he became acquainted with supporting musicians from an older generation, and through repeated collaborations, he gradually broadened his musical range. In his mid-twenties, he composed an original number featuring asymmetrical meters called “Devilish Waltz of A Soul”. Through this work, he became aware of the potential of asymmetrical meters, and since then has continued to refine that as the defining characteristic of his music. He graduated from university in 2010, passed the National Medical Examination, and obtained his medical license. Choosing not to enter a residency program, he decided to focus entirely on his musical career. Shortly thereafter, however, the physical strain resulting from years of maintaining a dual career led to numbness in his arms, forcing him to suspend his performance activities for approximately three years.

On June 9, 2013, he independently released his first album, [Devilish Waltz of A Soul ～ The Tango of February 26th ～]. After the album attracted the attention of “ULTRA-VYBE”, one of Japan’s major independent music distributors, he made his nationwide debut on September 18, 2013. His standard live ensemble consists of violin, piano, guitar, bass, and drums.

In April 2021, he composed “A Pond of Wonder - Theme of Monet’s Pond -”, an image number inspired by Monet’s Pond in Seki, Gifu Prefecture. He visited Seki City Hall and performed the number for Mayor Kenji Ozeki. This number is included on his fifth album, [Quintuple Meter Bible]. In March 2022, he undertook a solo tour of Spain, where he successfully gave his first overseas performance in A Coruña. During the same period, he filmed a music video for “Aroma de Roca”, a track from his second album, in collaboration with local staff.

In September, he carried out his second tour of Spain, performing in A Coruña and Madrid, and filmed the music video for ““Solea Far Beyond” while traveling through Toledo, Consuegra, and Madrid.

In October 2023, he held a concert commemorating the 10th anniversary of his debut at Suntory Hall in Akasaka, Tokyo. The program, which traced the evolution of his musical style over the past decade, was well received.

In October 2024, he undertook his third tour of Spain, successfully performing in Barcelona and A Coruña. During the tour, he filmed the music video for “Laberinto en 5 y 4”in Barcelona. He also appeared on the A Coruña–based YouTube music channel En Vilo, where he performed four numbers with local musicians. In April 2025, he was invited by the Iranian Ministry of Cultural Heritage to visit Iran, travelling through four cities -Isfahan, Varzaneh, Shiraz, and Tehran. In Isfahan. He filmed a music video for his original composition “Cloudy Isfahan”, which was inspired by the city, and in Varzaneh he filmed the music video for “CARVAAN”. In Tehran, he also gave a collaborative concert with Iranian musicians at the Embassy of Japan in Tehran.

In July 2025, he composed “For the Wine of Sunrise”, an image number for Ushiku Chateau in Ushiku, Ibaraki Prefecture. He visited Ushiku City Hall, where he gave a live performance for Mayor Kazutoshi Numata. The composition is included on his seventh album, [Monumental of Five Beats]. In November 2025, he was appointed as “Music Ambassador for Jiyugaoka South Exit”, recognizing the affinity between his music and the district’s brand image. During the 2025 Christmas season, his 5-beat Christmas number “The Lovely Gift of the Magi” was played at the south exit of Jiyugaoka Station as part of a special campaign.

A Focus on 5 beats and Asymmetrical Meters and Their Theoretical Foundations

Known by the nicknames “Mr. 5 beats” and “Mr. Asymmetrical Meters”, he has released many compositions that extensively feature asymmetrical meters, particularly 5 beats. When talking about 5 beats, he explains its rhythmic essence by moving his hands in a figure eight motion—one loop representing a three beat circle and the other a two beat circle—illustrating that the difference in angular velocity is the core of the 5 beats. He notes that the same principle applies to all odd meters (4+3 for 7 beats, 5+4 for 9 beats, etc.), establishing his own definition that “the essence of asymmetrical meters lies in rhythmic asymmetry”. Many of his works, including the representative number “Guernica Dogma”, employ even more advanced techniques in which beats change every measure. This approach is based on his unique method of deconstructing beats into the smallest units of three beat and two beat cells and freely reconstructing them according to the nuances of the melody, a technique he defines as “Cubism in music.” In many compositions, exemplified by “Solea Far Beyond”, he incorporates flamenco palmas (hand clapping) because his compositional approach—dividing the aforementioned beats into groups of three and two and reconstructing them—aligns particularly well with the concept of compás in flamenco music.

Around 2020, he learned from an acquaintance—a gonnegi (assistant Shinto priest) at Musashi Ichinomiya Hikawa Shrine in Ōmiya—that traditional Japanese gagaku music includes a form of 5 beats known as Yatara-byōshi. After listening to Baitō, a representative composition in that beat, he was inspired by the fact that it employs a 2+3 subdivision of five beats, in contrast to the 3+2 subdivision he had previously used. Drawing on this contrast, he devised a 5 beats rhythm he termed the “Neo Yatara Rhythm”, reviving the traditional structure as a contemporary chillout groove.

“Yatara Rhythm Graffiti”, included on his fifth album, was composed using this rhythmic concept.

To date, he has released seven original albums. His recordings incorporate a wide range of instruments, including accordion, vibraphone, steel pans, and horn sections. He has also frequently recorded with traditional Japanese instruments such as the shakuhachi, koto, and biwa. From his sixth album onward, recordings featuring Arabic instruments, including the darbuka and tonbak, have become more prominent.

“The Tango of February 26th”, included on his first album, was inspired by the February 26 Incident of 1936 in Japan.

“Guernica Dogma”, from his second album, was inspired by Pablo Picasso’s painting Guernica and was composed using his self-described approach of “musical cubism”, as outlined above.

On his third album, [Libertango My Own - Jonetsu no Gotairiku], he arranged and recorded well-known songs such as “Nagori Yuki”, “Kasa ga Nai”, “Boku ga Boku de Aru Tame ni”, “Jōnetsu Tairiku”, and “Libertango”, all reinterpreted in 5 beats and asymmetrical meters. Among these, the music video for “Libertango My Own” has received particular attention and has periodically ranked first on Apple Music jazz charts in multiple countries.

The title track of his fourth album, 「JAPON NEO SOUL 2020」, was inspired by Katsushika Hokusai’s “The Great Wave off Kanagawa” and begins with a sound evoking waves articulated in 5 beats. The work was composed with the 2020 Tokyo Olympic Games in mind.

On his fifth album, [Quintuple Meter Bible], he released “Sonnet for Silent Spring”, a composition inspired by Rachel Carson’s book Silent Spring. The same album also includes “Yatara Rhythm Graffiti”, a work inspired by Yatara-byōshi, a traditional Japanese 5 beats with a 2+3 subdivision found in gagaku music.

His sixth album, [Five Beats on the Frontier], features an arrangement of Pablo de Sarasate’s “Zigeunerweisen” in 5 beats. The album also includes “CARVAAN - Beyond the Dust”, an image number composed at the request of the contemporary Arabic-style restaurant CARVAAN, based in Hannō, Saitama Prefecture.

On his seventh album, [Monumental of Five Beats], he included “For the Wine of Sunrise”, an image number for Ushiku Chateau in Ushiku, Ibaraki Prefecture. The album also features his 5-beat arrangement of Stevie Wonder’s “Part-Time Lover”, 5 beats arrangements of “Sous le ciel de Paris” and “Sakura Sakura”, and a Neo Yatara Rhythm arrangement of “Coffee Rumba”.