Jay-Z has admitted he's forgotten a lot of his own lyrics.
The rapper had to recall his words when writing his book Decoded, in which he reveals the inspiration behind his songs.
He said: "The hardest problem was getting the lyrics right, 'cause I don't write them down, so, we had to find them somewhere, and a lot of those songs I forgot."
Jay-Z, who has just had to deny that his wife Beyonce is pregnant, added: "So I had to listen to them again and then look at the lyrics and then say, 'No, that's wrong.' So the hardest part was really getting the lyrics right."
But he added that he really enjoyed the process of revisiting his songs.
He said: "That was fun. It was almost like looking at an old photo album, like going back through those emotions and feelings. Looking at this song was like looking at me with a high-top and the four-finger ring."