I highly recommend listening to them! They're all more modern pop style stuff, with lyrics and stuff. The ending theme is nice. Of the other four, I quite like #23 山河不破 and #24 镇断魂. I'm pretty sure none of them was featured in the drama itself. Perhaps they were planned and then axed due to budget issues/no space? If only someone more knowledgeable of the behind the scenes of the production issues could help.

... I should write a post on "and 生者之魂 is the Dramatic Things Happen music, which I rate 5/5", shouldn't I.