1. Tu Pimp a Caterpillar. I just learned of this yesterday. It was supposed to be the original title of To Pimp a Butterfly as an homage to Tupac but they changed the album title to what it is now at the last minute
2. An oldie and a goodie: Positive K rapped all parts on his one hit 'I got a man'. That is, he voiced the women's response to his advances in the song