After the breakup of Folk Crusaders in 1970, Katō gained success for his production works for other musicians, including Shigeru Izumiya, Mariya Takeuchi, and Takuro Yoshida. In particular, Sadistic Mika Band, the acclaimed project he started with his first wife Mika Fukui, received international success. Their 1974 album entitled "Kurofune (The Black Ship)" is regarded as one of the most significant Japanese rock albums of the mid-1970s. The group was disbanded and reassembled again several times, with new vocalists such as Yumi Matsutoya, Karen Kirishima, and Kaela Kimura.