edit:
nice, version 7 of the pal demo discs contains a remix of termina field as background music!
https://www.mediafire.com/?ja8dwjboc4h87c3
edit2:
if you like the f-zero gx theme you'll probably enjoy this extended version I found on the japense summer 2003 disc
https://www.mediafire.com/?jqiaaa3pf35ucy5
edit3:
this is way too much fun hehe, just found a agb emulator on disc 18 and there was another file titled .new beside it, just compared it and it just had a different border:
http://postimg.org/gallery/hf415du2/
on the left you can see the one in the .new file probably nobody ever saw and on the left the one you can see when playing disc 18. this is probably the first time anyone outside of nintendo saw that little piece
oh and I see why it wasnt used, somebody did not know what the actual gba proportions actually are lol.
http://s20.postimg.org/y333hbh4d/DISE01_1.png