If anyone wants to remove the music that comes on after you sink a ship, you need to edit music.cfg in this directory C:\Program Files\Ubisoft\SH3\data\Sound\Music
Make this section look like this
[JOY]
Tracks=1
;Track1=Happy_Times_4.ogg
;Track1=empty.ogg
;Track2=Joy_2_Master.ogg
;Track3=Joy_3_Master.ogg