Mysterious Skin soundtrack

The Mysterious Skin soundtrack arrived in the mail today; it's sublime. The CD is incidental music only (the Slowdive/Ride/Curve songs in the film don't show up here), composed by Robin Guthrie and Harold Budd. Lots of reverb and delay textures. and Guthrie's guitarwork is at its most sublimely ethereal since Victorialand.

I'm not familiar with Harold Budd's work other than this; what's a good starting point?