io9. has been counting down the Top 100 Albums all science fiction and fantasy fans should listen to. At #46 is The Decemberists’ wonderful rock opera The Hazards of Love, which includes The Rake’s Song.
In the spirit of the article, I’d also recommend The Crane Wife. The title songs tell a traditional Japanese folk tale, the final song on the album paints imagery of people settling a new society, and a bonus song (available through iTunes) tells of survivors in a post-apocalyptic world. It is one of the most beautiful albums I’ve ever heard.