Goku has been the subject of, and is mentioned in, various songs. "Son Goku Song" and "Gokū no Gokigen Jānī" feature Goku as a child singing about himself. During his adult years, the song "Aitsu wa Son Gokū" by Hironobu Kageyama, where Kageyama praises everything about Goku, and the duet "Ore-tachi no Energy" feature words spoken by the character. For the release of the single of the "Dragonball Evolution" international theme song "Rule", Toriyama supplied CD artwork of singer Ayumi Hamasaki dressed as Goku.