Gera Gera Po

"Gera Gera Po Song" (Japanese: ゲラゲラポーのうた, Hepburn: Gera Gera Pō no Uta; lit. 'Hahaha Song') is a song recorded by the Japanese music unit King Cream Soda. Tomoki Kikuya composed it and band member Gerappa (credited as Motsu) wrote the lyrics. King Cream Soda were formed specifically to perform the song, which was created as the opening theme for the anime adaptation of Level-5's multi-media franchise Yo-kai Watch. It was released as their debut CD single on April 30, 2014, by Frame, a joint venture record label owned by Level-5 and Avex Trax. Musically, "Gera Gera Po" is an upbeat track that quickly transitions between both Western and Japanese genres such as rock, hip-hop, pop, min'yō, and enka. The choruses feature repeating use of the rhythmic title phrase, "gera gera po".

Upon release, "Gera Gera Po Song" debuted at number four on the Oricon Singles Chart and number nine on the Billboard Japan Hot 100. It sold over 250,000 copies and was certified gold twice by the Recording Industry Association of Japan. Writers considered the track catchy or addictive and analyzed its popularity, particularly among children; some considered the song a social phenomenon. It won the Hot Topic Prize at the 2014 Japan Cable Awards and was named as one of the greatest and most memorable hits of 2014 by Tower Records Japan.

The song's music video was directed by DJ Hiro and features choreography created by Lucky Ikeda. The dance involves performers placing their hands above their stomach in accordance to "gera gera" and pointing their index fingers upwards on "po". Critics considered the choreography easy to learn and a factor to the song's success. King Cream Soda performed the song for various events, festivals, and television appearances, which included two-year consecutive appearances on NHK's New Year's Eve music special, Kōhaku Uta Gassen. The band released several follow-up songs that continued to use the "gera gera po" phrase. They were compiled onto their debut studio album, Bye Bye Gera Gera Po (2015), after which they retired the phrase. Alternate versions and a cover of "Gera Gera Po Song" have appeared in various Yo-kai Watch media.