Moon Ray was recorded on 21 and 22 April 1977 in Japan for the Three Blind Mice label. The album features the quartet led by alto saxophonist Yoshio Otomo, accompanied by Tsuyoshi Yamamoto (piano), Tamiko Kawabata (double bass) and Arihide Kurata (drums). The programme consists of standards from the American jazz repertoire as well as an original composition by Otomo. The production is part of the TBM label's series of acoustic recordings.