Limited 80 copies, numbered. Legendary 1973 recordings by the sound artist Yoichi Niisato. The cassette tape recorder played an important role in Niisato's unusual works  - as the recording of his footsteps in a subway car - through a cicle of works titles 'Research' that were subsequently described in his autobiographical book, Story, which was published in 1982. "The break is over, and I put on my work clothes. Don’t be cool. The hands that hold a drill are singing. There is a feeling of cold, hard iron, and the sound is a husky voice and a high tone. Put the blade into oil and sing with Elvis. You’re vocal; we’re the chorus. As expected, it’s too hard! The sound is a powerful weapon of the song; it’s amazing!"