Ichimaru (市丸), born Matsue Goto , 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.

Katsutaro Kouta was a Japanese female geisha and ryūkōka singer, who performed in the "New-Min'yō" style of singing. Kouta came to be most well known, alongside another popular geisha singer, Ichimaru, in the "Katsu-Ichi Era".