Yeah, Kendrick was forced to release this song with this old melody. If you notice rappers are making songs with old melodies, they have to, if not, the industry cuts them off. This is what happened to, you know that guy Humpty Dumpty with the big nose. That's why he only had that one hit. It's also why there's so many one hit wonders because they don't want to continue with the songs and the album that the industry is making them do.