I made these 3 myself. Some sections of each were very tricky to link together with the tempo variations of different songs but They're the best I could do.

Original Bowser Battle Chorus Remix: http://www.sendspace.com/file/m0w5b9

Bowser's Final Battle Chorus Remix: http://www.sendspace.com/file/vscckq

Bowser's Galaxy Reactor Chorus Remix: http://www.sendspace.com/file/tn6hxc

so how do u remix song please help me cause i want to do this 2

Okay, the first song's tracks are out of sync. The second and third songs are nice attempts at remixes, but I feel that chopping up the chorus track of Bowser's Battle Theme simply doesn't cut it here. The violin and trumpet elements interfere with the rest of the song. If I were to make an attempt at a chorus remix, I would probably use MIDI, since it would be easier to create a chorus track to match the melody or rhythm.

I like the concept, though. I wanna hear a chorus melody remix of Bowser's Galaxy Reactor :)