Rhymester (ライムスター Raimu Sutā) is a Japanese hip hop group consisting of MCs Mummy-D and Utamaru, and DJ Jin. The group is one of the oldest Japanese hip hop acts, having formed in 1989. They debuted on an independent label in 1993 with the EP Ore ni Iwaserya (俺に言わせりゃ), which received severe reviews from critics. Later on, they released several studio albums and gradually became popular among not only hip hop fans but also rock fans, as they frequently collaborated with rock musicians such as Kiyoshiro Imawano.