Toilets in Japan date back 2,000 years. A modern one typically features a heated seat and electronic bidet. Recent trends include new toilets for the elderly and infirm, and for use after a disaster. Our expert guest, architect Shiohiko Takahashi, is a leading researcher and designer of toilets who has surveyed public toilets throughout Japan. This time on Japanology Plus, we'll see how the Japanese relate to an essential everyday item. And in Plus One, a look at state-of-the-art public toilets.

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.