There are more than a handful of shakuhachi pieces with the title Tsuru no Sugomori, which means Nesting of Cranes. Many of them are characterized by onomatopoetic effects. They are often divided into sections that correspond to stages in the life of a crane. Sokaku Reibo is the Nesting of Cranes according to the Kinko school. The Kinko-ryu was founded by Kurosawa Kinko (1710-1771), who canonized a repertoire of about 40 pieces. Even today Kinko students play only these pieces, because their teachers play only these pieces, because their teachers played only these pieces, and so forth.