Listen to The Hobbit's "The Song of the Lonely Mountain" by Neil Finn!
"'The Song of the Lonely Mountain' was developed from a dark and mysterious theme which the dwarves sing early in the movie," Finn tells Rolling Stone. He says Jackson and his team suggested he get in a "dwarven state of mind" as he shaped the song to play over the end credits. "After some days of mining underground (actually, in Peters office) I emerged with the song, then set about recording it with my sons Elroy and Liam. Dave Fridmann came in at the end with a bold mix. He seemed to respond well to my demands for 'more anvil!' Pop music needs more anvil!"
After a few listens, I definitely think it has a dwarven feel--of sorts-- to it. His voice certainly isn't reminiscent of a dwarf, but some of the bombast and chants lend it that earthy, gravelly, underground smithing spirit that dwarves embody.
Is it better than "May it Be", or "Gollum's Song", or "Into the West" (from the LOTR films)? That's tough... it's definitely different, and sets a completely different tone. It may not be better, but it's seems appropriate.