The song is performed by Lovelitchi on vocals, and Melodytchi on violin. Lovelitchi created the lyrics with the help of her Tama-Friends. Happy Happy Harmony also has another version, Happy Happy Birthday that was released on Mametchi's Birthday (Tamagotchi's Birthday) on November 2010. A special rock-style version of Happy Happy Harmony released on the 19th of November, exclusively on the Ready GO Hasha GO Daishu GO! Tamagotchi! CD. The special version features Yumemitchi and Kiraritchi singing along with Lovelin, and the Kirakira Girls playing along with Melodytchi and her violin.