EXPO 2025 CO-DESIGN PROJECT

Sound Design

Ensemble of Lives

Changes according to the biorhythm

The human body is regulated by its biorhythm, which varies in the morning and the evening. We see such internal changes as the “rhythm of life” and alter the sounds accordingly throughout the day. In the morning when the body and mind are switching into an active mode, cheerful sounds that help boost your concentration are played. From the evening to night when the body starts to unwind, relaxing sounds are played to harmonize with activities of the parasympathetic nervous system.

At the venue on Yumeshima Island, nuances in sound change in accordance with time and in response to each “life.”

Concept details

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Rhythm of life—Changes according to the biorhythm

The human body is regulated by its biorhythm, which varies in the morning and the evening. We see such internal changes as the “rhythm of life” and alter the sounds accordingly throughout the day. In the morning when the body and mind are switching into an active mode, cheerful sounds that help boost your concentration are played. From the evening to night when the body starts to unwind, relaxing sounds are played to harmonize with activities of the parasympathetic nervous system.
At the venue on Yumeshima Island, nuances in sound change in accordance with time and in response to each “life.”

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Changes in response to the weather

Because of the nature of the Grand Ring, visitors may be acutely aware of the changing sky at the venue. The soundscapes here change in real time based on the current weather information from a meteorological sensor at the venue.
When sunbeams appear from between clouds, or when the rain clears and every living thing starts radiating again, you may feel a sense of excitement. Your feelings may subtly change in response to the changes of weather. The sound image is always changing accordingly.
On a sunny day, light and crisp sounds are played; on a cloudy day, relaxing sounds; on rainy days, peaceful, minimalist music. Every change in the sky in-between is well expressed through lively sounds. These nuances in sound are expressed through musical structures, instrumental sounds, and combinations of effects. Even during the same time of day, soundscapes keep changing little by little all the time according to the changing sky.

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The timekeeping system and time signals in the Edo period—Changes in accordance with the position of the sun

Until the end of the Edo period (1603-1867), people in Japan recognized the flow of time using a different method from today. It was called the traditional Chinese timekeeping system, as it was used in China until the early 17th century and in Japan until the late 19th century.
This timekeeping system divides the time period from sunrise to sunset into six and the rest of the day, from sundown to sunrise, into six. In total, one day is divided into 12 periods. In this system, the length of each period during the day varied by day and season. This is known as the seasonal time system based on the natural rhythm. At that time, the “time signal” system was adopted and bells at castles, temples and in towns were struck to announce the time throughout Japan.
We have designed the soundscape of the EXPO venue inspired by the idea of the seasonal time system. Each different musical piece in each area at the EXPO venue is played in time with the Edo-period “time signal,” creating harmonious and multi-layered soundscapes that embrace the venue.

With the theme of “Co-creation,” sounds are designed using the Edo-period time signal

Six composers make a three-minute music piece, reflecting each theme within the six areas. At a predetermined time based on the Edo time signal system, all the compositions are played in concert. In the final 60 seconds, elements of each music piece’s sound in one area are inserted into another area’s sounds and mixed across the sections.
All the music pieces are composed based on E chords and have a tempo of 120 BPM, which creates a seamless harmony across the entire venue. The composers reflect each section’s concept and use many different instruments and diverse sound elements. With these combinations, multi-layered, rich soundscapes emerge in every corner of the EXPO venue.
As each piece of music is played, the speed gradually accelerates and the tension intensifies. At its peak, all the sounds end up with E chord containing E, G#, and B. This E chord keeps resonating across the entire venue for roughly 15 to 16 bars (for about 16 seconds). This is a symbolic moment in which the concept of “Ensemble of Lives” embraces the entire venue. This sound design is derived from the EXPO 2025 Design System’s theme that asks—Can we overcome divides and become united? It has further sources of inspiration, such as the Grand Ring that is a symbol of linking the world, and the ending of the song by the Beatles, “A Day In the Life.” We envision a world in which countless lives mingle and resonate through the creation of these soundscapes.

The introduction inspired by the Edo time signal system

Before each piece of theme music begins to play in each area, what resounds is a sound work created by sound artist evala and composer and scientist Itsuki Doi. This sound piece is played as a prelude to the other musicians’ works through more than 600 speakers installed across the EXPO venue for the purpose of disaster broadcasting.
The timing of when this sound work is played varies by day and season because this work has been created based on the seasonal time system used in the Edo period.
This work is also programmed to change resonance depending on weather at the time the music is being played and the locations where visitors listen to it. Visitors can enjoy multiple nuances of this work in different situations.

*A soundscape is the acoustic environment as perceived by humans, in context. The term, originally coined by Michael Southworth, was popularized by R. Murray Schafer (cited from Wikipedia).Schafer believed that landscapes need sounds. This idea has led to soundscape design.

Circulation

Entire venue

Inspired by the traditional Chinese timekeeping system used in the Edo period, the soundscape, featuring signals that announce the time, embraces the venue. The sound work, created by sound artist evala and composer and scientist Itsuki Doi, is played and echoed across the entire venue. Then, music pieces composed by the six artists are played, based on the concept of each area. In the final 60 seconds, elements of each music piece’s sound in one area are inserted into another area’s sounds and mixed across the sections. The music works end with E chord containing E, G#, and B. This E chord resonates across the entire venue, creating a whole new soundscape where harmony and diversity intersects.

Edo jiho tracks
All Artist
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    evala
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    KEIZOmachine!
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    Midori Hirano
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    Masayoshi Fujita
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    HIROSHI WATANABE a.k.a KAITO
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    Koshi Miura
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    Kuniyuki Takahashi
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Life

Life Park

This area, located in the center of the EXPO venue, accommodates many signature pavilions. The sound works express that lives are created here. Primarily, works by sound artist evala are played. The other six composers have also created their 210-second theme music pieces for the brief sound and light shows, with mist sprayed from the center of the park, that are performed four times an hour.

Sound Artist
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evala
Musician and sound artist evala is also the founder of “See by Your Ears,” a project that creates new auditory experiences. He has released innovative works both in Japan and overseas through his original method of “spatial composition” using three-dimensional sound systems as instruments. He has been received numerous awards both in and outside Japan, including the Prix Ars Electronica and the Japan Media Arts Festival awards.
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    KEIZOmachine!
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    Midori Hirano
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    Masayoshi Fujita
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    HIROSHI WATANABE a.k.a KAITO
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    Koshi Miura
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    Kuniyuki Takahashi
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Festival

Before and after the gates

The theme of the area near the gates is “Festival.” In these music pieces, sounds of world-wide folk music instruments fade in and out over the backing track of Japanese traditional festival music and electronic sounds. This sound design suggests this place could be anywhere in the world or nowhere at all. Visitors can feel a one-of-a-kind festive mood that can only be enjoyed at the EXPO.

Sound Artist
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KEIZOmachine!
KEIZOmachine! is the originator of finger drumming in Japan. As a member of HIFANA, he performs original live shows around the world, perfectly synchronizing sound and visuals without the use of programming. As a composer, he has provided a wide range of sounds works for TV programs and web commercials. Notably, he composed the athlete entrance march for the Tokyo 2020 Olympic Games closing ceremony.
Time x Weather Tracks
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City

Around each square

In the City area where many pavilions are located, sounds inspired by our daily life resonate. Audio of instruments mixed with everyday sounds express the bustle and energy of cities while making visitors feel somewhat nostalgic and at ease.The sound works here effectively feature daily rhythms that people have nurtured by connecting and mingling with other people.

Sound Artist
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Midori Hirano
Midori Hirano, born in Kyoto, Japan, is a Berlin-based musician. After graduating from university with a major in classical piano, she began creating a wide range of music pieces, incorporating acoustic instruments, electronic sounds, field recording, and sampling. She excels in skillfully blending digital and acoustic sounds and displays outstanding compositional techniques.
Time x Weather Tracks
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Forest

The Forest of Tranquility area

In the bustling EXPO venue where many people flock from across the world, The Forest of Tranquility and its vicinity is filled with a peaceful tranquility and a relaxing atmosphere. In this area, calm sounds of instruments and pleasant electronic sounds are gently harmonized to create a deep, soothing sound to embrace visitors.

Sound Artist
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Masayoshi Fujita
Vibraphonist, marimbist, and composer, Masayoshi Fujita explores new sonic and instrumental possibilities, far from traditional techniques and performance styles, as well as conventional compositional methods. His music is often described as cinematic as he creates his distinctive sound pieces inspired by natural elements such as the depth and silence of mist and majestic mountains. Using experimental approaches, he pursues the fusion of vibraphone with electronic music, balancing the acoustic and the electronic, as well as analog and digital elements.
Time x Weather Tracks
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Water

Water Plaza

As the Water area faces Osaka Bay, it feels like this place is connected to the world through the sea. Water can change into many different forms and can be a symbol of diversity. It is also the source of life and the sea has provided trading ports and helped nurture people’s connections. These sound works help visitors expand their imagination of future landscapes as they enjoy the scenery from Yumeshima Island.

Sound Artist
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HIROSHI WATANABE a.k.a KAITO
HIROSHI WATANABE graduated from Tokyo College of Music High School and Berklee College of Music in Boston, in the US. His lyrical, nostalgic, and deeply emotional sound works evoke a vividly cinematic soundscape. Using his unique layering method and synthesizer phrasing, he seamlessly crosses genres, from danceable rhythms to beatless ambient music. His original style of sound production is highly regarded by global audiences. In 2014, he performed with the WDR Symphony Orchestra Cologne, in Germany. He has released numerous works across the world. They include works under the name of KAITO released from Germany's KOMPAKT label and those from the TRANSMAT Records label led by Detroit-based musician Derrick May.
Time x Weather Tracks
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Sky

The roof of the Grand Ring

The roof of the Grand Ring offers visitors an enchanting view of a boundless sky. The sky changes its appearance over time, from morning, to an evening glow, to night. It also varies depending on the weather and the seasons. In response to its changes, the sound works of this area also shift in nuances. Like birds flapping their wings and the breeze blowing, all living things are connected with a far distant universe…. Such a sense of liberation is expressed in these sounds accentuated through the resonance of lives.

Sound Artist
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Koshi Miura
Artist Koshi Miura is a leading musician in the band KUCHIRORO. He also serves as leader of both the Skytree Choir and the Nazeshio Choir.
Time x Weather Tracks
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Ground

Beneath the Grand Ring

The Ground area is situated under the Grand Ring. The sound pieces here express people’s everyday lives, history, as well as the pulse of the earth, appealing to the depth of visitors’ hearts. The passage of time where lives have emerged and evolved dwells within these sound works. As you climb to the roof of the Grand Ring, you may notice the transition of the sounds from the Ground to those of the Sky. Listen carefully and enjoy the changing sounds.

Sound Artist
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Kuniyuki Takahashi
Multifaceted musician Kuniyuki Takahashi makes full use of almost all elements of high-quality music, including consistently warm, occasionally complex, chord progressions, thrilling compositional development, and rhythms that feel deep and powerful. As a Sapporo-based musician, he is known for collaborations with renowned overseas artists. He performs live, energetic concerts across the world, from the Western countries and Asia, to South Africa, captivating audiences worldwide.
Time x Weather Tracks

This project uses weather data from OpenWeather (One Call API 3.0), licensed under Creative Commons Attribution-ShareAlike 4.0 (CC BY-SA 4.0) and the Open Database License (ODbL). © OpenWeather contributors.