1.
parody song; song with altered lyrics sung to a familiar melody
A version of an existing song where the original lyrics have been replaced with humorous, satirical, or otherwise different words while keeping the same melody. Popular as entertainment among children and in comedy.
Compound of 替え (replacement, from 替える) and 歌 (song). The concept is similar to English parody songs — the melody stays the same but the lyrics are changed, usually for humorous effect.
Common collocations
Cultural note
Parody songs are a staple of Japanese comedy (お笑い). Comedians like Shimura Ken and Hiro Iki have made 替え歌 a popular entertainment format. Children also commonly create 替え歌 of school songs and popular tunes.