How do singers, especially lyrically dense rappers, memorize dozens or even triple digit number of songs?

Question

I’m notoriously bad at memorizing lyrics so it’s mind boggling to me.

In: 368

Answer 1

I know the lyrics to dozens, if not hundreds of songs.

I can recall hundreds of characters and plotlines from hundreds of books, movies, and shows.

Surely, memorizing one’s own work can’t be that difficult?