Ichimaru (市丸), born Matsue Goto (後藤 まつゑ, Gotō Matsue; July 16, 1906 – February 17, 1997), was a popular Japanese recording artist and geisha. Her rivalry with another popular geisha singer, Katsutaro Kouta, created the "Katsu-Ichi Era" in Japanese music history.
Source: “Ichimaru”, English Wikipedia (CC BY-SA 4.0), excerpt