Sachiko Kakazu (née Oita (老田 佐千子), is a Japanese composer and sound designer who worked for Make Software. She was usually credited alongside Akihiro Akamatsu. Sometime during the 90's, she married game developer Takeo Kakazu.
As previously mentioned, though not an alias, Sachiko married during her career, and as a result, later games credit her surname as Kakazu.
In the Japanese version of Milon's Secret Castle (GB), she is credited as Jam Session, but the North American release reveals the alias as belonging to S. Oita.