"It's no real surprise that Wikipedia has a thorough list of these, but it's interesting to parse through the many, and find a neat collection of songs and albums that were based on, or influenced by books. Led Zeppelin has a scatological lyric library referencing JRR Tolkien, but let's see what else is out there."
Adam Gopnik discusses the appeal of high fantasy in YA. He misses the mark, I think, in not discussing Joseph Campbell's influence in all of this, and he's condescending throughout much of the piece, but it's an interesting analysis aside from these two admittedly major issues.