A few hours ago the official 'ilumination' account released a video of the BOWSER song! and really lighting is taking over animation and this song has been trending after the movie premiere.

This song is simple but fun and catchy! and really this song was not in the official script of the movie but the actor who plays Bowser's voice composed the song and they liked it so much that they even made a post credit scene with Bowser playing the song! hehe I guess that's why the movie has 2 post credit scenes!