Sam Andreae, Li Song, and Rory Salter are UK based artists. All of them perform and present their works in a minimalist style, and they are all noteworthy figures among current artists who take an experimental approach. As the title suggests, this work consists of four performances using three melodicas. Silence and sustained sounds produced by the instruments appear and disappear, creating single notes and harmonics. They are performances of intense concentration, and at the same time, it is a wonderfully accomplished work for listening work.