Several years back on this thread, someone mentioned "Terrapin Station" by the Grateful Dead.
I happened to be re-visting this work for the first time in a while. It had caught my attention years ago and I hear why. It is a most interesting piece. Lots of progressive rock and classical elements (the Dead really did that?) with quite poetic lyrics. Very unique + very enjoyable. Achingly beautiful? Well, yes I suppose so in the Dead's typical low key manner though.....