"Teitei Shinjae" is an original song by TadanoCo-P featuring Hatsune Miku. According to TadanoCo's twitter, the word tei tei (ていてい) is taken by "たてまえ"(建前, tatemae), but with a deeper meaning. Tatemae means the behavior and opinions one displays in public. Contrary to ほんね (本音, honne), which means a person's true feelings and desires. They are often kept hidden, except with one's closest friends. This song has entered the Hall of Fame. It is featured in the album Nonsense (ナンセンス).