Many people sing the same melody in vocal music, which is obviously singing in unison. Don't mislead others if you don't understand it.

folk songs, minor and labor songs belong to the category of folk songs

Triple C

HIP-HOP and heavy metal rock music belong to the category of pop music in a broad sense. If you have to choose one, it is hip-hop.

think about the content of the class songs by yourself, which can be considered from the lyrics and the artistic conception of the songs combined with the actual situation in the class. The understanding of the class song means that the class song is the artistic representative of the class collective and the spiritual banner of the class collective, and the experience of singing can be copied everywhere.