"Kaettekita Yopparai (I Only Live Twice)", their psychedelic debut song composed by Katō and released in 1967, sold more than 1.3 million copies in Japan, and became one of the best-selling singles of the early Japanese popular music industry.

[1] The group also starred in director Nagisa Oshima's 1968 film Kaette kita yopparai (alternately known as Sinner in Paradise or Three Resurrected Drunkards).

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.

[2] As a composer, Katō wrote the theme song "Ai Oboete Imasu ka" for the anime film Macross: Do You Remember Love?, which was released during the summer of 1984 in Japan.

In 1990, Katō teamed up with graphic artists, Haruhiko Shono and Kuniyoshi Kaneko, to provide the music for the award-winning Japanese computer game, Alice.