hi,
I recently ripped this music into .vgm files! You can download a .zip file of it here:
http://www.geocities.jp/playgamemusic/Back_Stage.htm
You can also get GG Shinobi II here:
http://www.smspower.org/music/vgm/index.shtml?PHPSESSID=0bc3b04cbb0d2994e0ed631e55632132
You need special software to play it. Go here if you want it:
http://www.smspower.org/music/vgmtools.shtml
Matthew
[email protected]