ていていしんじゃえ (Teitei Shinjae)

Background
"Teitei Shinjae" is an original song by tadanoCo 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).