I remember playing a level from Disguise quite some time ago, it contained a very neat chiptune. The extension was .xm if I remember correctly.
The tileset with the tune was quite small, and contained a lot of colors.
Sorry if im being vague, but I dont remember anymore. Thanks in Advance.

http://www.jazz2online.com/downloads....php?userID=35

Thanks Stijn, I found it.
Anyone needing it can find it here:

http://www.jazz2online.com/downloads...dreamy-mirrow/