I suppose it is possible to make music with an animal horn that has no holes or keys. Historically I think the shofar is similar to horn fanfares, or fanfarade, also referred to as a flourish. The idea being some loud, fixed tones which would draw attention (to the entrance of royalty, an announcement, etc) or signal action in battle.
I'm not even sure that shofars are tuned to a specific pitch (or pitches).