Shadow Gallery is simply one of the greatest bands around by now (obviously, IMO). Their musicianship is terrific and the quality of their melodies and composing skills are unbelievable for such an unknown band.
If I had to pick just one song, I would go with New World Order or Ghost of a Chance. Definitively "Tyranny" is IMO their best effort to date and one of the most underrated prog albums out there.