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A novelty song is a type of song that is meant to be funny, usually because of silly lyrics or lyrics that don't make a lot of sense. A song is considered a novelty song when it uses strange lyrics, strange music, out-of-the-ordinary subject matter, or any combination of the above. However, not all comedic songs are novelty songs.
Novelty songs are often parodies, mocking or poking fun at a popular topic or fad.