BASED ON MUSIC BUSINESS

The hip hop artist, IDK recently released a song in which he raps, "I'm trying to right my wrongs, but it's funny, those same wrongs helped me write these songs."

The lyric was originally used on a song that was written and performed by Kanye West and released via Def Jam Records, entitled, "Touch The Sky".

1. What part of the "Touch The Sky" did IDK use in this scenario.
2. Does IDK need permission to do this?