Enjoyed by Japanese of all ages, choral singing is a feature of school events, tour buses, baseball games and various other everyday situations. Group singing comes from a background of using songs to drive home ethical principles and lessons from history. On this edition of Japanology Plus, we see and hear why the Japanese love singing together. Our guest Hiroshi Watanabe, a musicologist, analyzes various types of social change through the lens of music. And in Plus One, a look at Japan's national anthem.

Japan is a volcanic hotspot, with 7 percent of all the world's volcanoes. The archipelago actually contains 110 active volcanoes, and throughout history, Japan has been at the mercy of the terrifying power of volcanoes.