Sigur Rós' ethereal music didn't just materialize out of thin air. You can trace their chamber-pop stylings back to Talk Talk, and their soaring sense of uplift is what buoys Spiritualized's spacious anthems. Brian Eno's and Aphex Twin's ambient miniatures had a major impact on the atmospheric dimensions of their sound, as did ‘70s rockers like Led Zeppelin and Iron Maiden, just in very different ways.