Retracing Radiohead's uncharted steps from their start as early ‘90s alt-rockers adds fresh context to their various musical obsessions. The frailest laments, such as “Desert Island Disk,” sound even more ghostly next to the rowdy, storm-twisted guitars of “Electioneering,” which in turn seems thrillingly red-blooded and raw next to a neurotic synthetic soundscape such as “Kid A.”