I just realized I'm literally the only person who's posted any rap in a Sinitic language on this thread...
So here's a Mandarin rap from the 2006 Singaporean movie I Not Stupid Too
with subtitles in Traditional Chinese (there's another video with subtitles in both Traditional Chinese and English, but the timing is screwed up):https://www.youtube.com/watch?v=CDwJMVEcdX0
This is another one that Youngfun once posted in the Forum Song Contest (FSC). It's mostly in Wenzhounese but also has a part in Finnish:https://www.youtube.com/watch?v=6oylJ-9A0iI
Youngfun's transcription of the lyrics in Wenzhounese using etymologically correct Chinese characters, complete with notes about pronunciation errors + the lyrics in Finnish as once corrected by Varislintu, with one slight modification I think she didn't catch (+ one line in English just after the Finnish part
This is in Sakha and was also once posted in the FSC, but the link that was posted is dead now, so I'm reposting it. See video description for lyrics (if you're trying to follow along with the song, note that the chorus consists of the first two lines, followed by the next two lines, followed by those same two lines repeated, and finally the first two lines again)
This one is in Congo Swahili and English:https://www.youtube.com/watch?v=qBdExK4VAc4