Hmmm. I've read a series, can't remember which one right now, that featured many worlds. FTL drive starships and worlds where the people determined the level of technology. It seems that somehow the dead found a way to cross back over and take over living bodies...perhaps you know the work? One of the worlds featured steampower as the highest level of technology allowed. But they were aware of higher tech. So it's close but *technically* no cigar.
I pawed around through my paperback collection and I can't find it right now. Oh well, it's not that important. I grasp the concept. Not certain about the music, interesting may be a kindness. I would have to hear it.