I agree with Lab Rat who wrote that this album is "scary", as it does stir the butterflies in the stomach. I think this is down to the extensive use of very low frequency ambient sounds which have an unsettling effect on the listener. This is very much an album to listen to in a quiet room with good-quality speakers that can render bass notes effectively. To my mind, it's a continuation from Immortal Memory, the sleeve notes of which make plain that it's a highly religious, devotional work. The Silver Tree is even more devotional and intense, and highly affecting even for this atheistic reviewer. It's a bit like sitting in a vast cathedral listening to an ethereal choir accompanied by a massive stomach-rumbling organ and a chamber orchestra.
Gone is the exotic eclecticism of Dead Can Dance, to be replaced by intense introspection and worship. This is neither good nor bad, more a 'phase change', but it's hard to see how much further Gerrard can go down this path. At this stage, I feel that she could do with Brendan Perry back to jar her from her introspection and get her exploring other musical styles, as she and he were so good at with DCD.
The only sour note in an otherwise fine opus is the execrable electro-poppy track 6, which completely destroys the contemplative atmosphere built up by the previous tracks.