The 1st of those 2 is on the right track. It needs to sound otherworldly, ethereal, dark, dreary, and maybe even a little bit scary (not like a scary movie but different). But it also needs to have a recognizable tune. All of the instruments (no organs or brass instruments) all need to be perfectly in sync. It doesn't need to have 4 beats per measure, but the rhytm needs to be easy to hear and follow along with.