Whenever a musician participates in the writing of song composition, lyrics, or arrangement, the Korea Music Copyright Association (KOMCA) puts it on their records.
Here are the top 100 idol song-writers on the KOMCA list with the most number of copyrights under their name as of 01st January 2022.
Note: Writing a whole song and writing a verse in the song is different cases. But KOMCA does not separate these two situations. Both cases count one as royalties on KOMCA. Therefore, all of the copyright-related lists are mixed like above. As the maker of the list, I can say that the most of the rappers on the list -not all but most- just write their own verses.
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Wow if they really separate those who write a whole song and a verse, you can see who is the one that can retire and still earn royalties from their song composition. Just take for example Mariah Carey with her "All I want for Christmas is you"