Japanese progressive rock band Kenso was formed in 1974 by Yoshihisa Shimizu (清水義央). The group went on hiatus shortly afterward due to Shimizu's medical studies. In 1979 they began to work together in earnest again and released a self-titled album the following year. Two years later they released Kenso 2nd, and Kenso 3rd was released in 1985. One year after, they released a live album, In Concert and the following year the group released Self Portrait, a compilation album. The group's next album, Sparta, was released in 1989.