Why was will smith rap song for season 1 was put on for the other seasons 2-6, it would have been cool to see him rap diff'rent rymes for each season ???

https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI