“City Borders” was a concept album and soundtrack for the documentary film “From Border to Border,” which told the story of Chinese immigrants in Kolkata, India. The album was conceived as a companion piece to the film, which focused on the descendants of Chinese migrants who moved to Kolkata during the 18th and 19th centuries, but whose numbers in the city today are decreasing. Yufeng composed a number of pieces for the album, working with a cast of friends and musicians, including German accordionist/composer Wolfgang Obrecht, singer/guitarist David Chen, guitarist Ken Ohtake and Taiwanese singer Wan Fang.