SHIMIZU Yasuaki and SHIBUYA Keiichiro are both excellent players of acoustic instruments: the saxophone and piano. However, they have also been creating unusual sonic experiences in recordings and live performances utilizing technologies. The two musicians encounter for the first time in this showcase, and a “session of echoes” will be realized in the space of the Medium Hall of Tokyo Metropolitan Art Space. Reverberation of the sound of the saxophone and piano will be created by digital processing, and it will be sent in a multichannel format to the loudspeakers embedded in the wall of the theater. In this live performance, the saxophone and piano, as well as the acoustic sound and reverberation will be intermixed and the particles of sound will fill the space.