20:46 - 23:34 What's this song?
Not sure about the original song, but when I SoundHound-ed it, I found "Russ woke" from Argentina:
https://www.youtube.com/watch?v=Nh8NTW9zS3M
You can hear the original motive of the song, covered by some rap. Not sure about the original song though. Let me know if you find out.