Is it the vocals or everything? Early Muse and early Radiohead surely have parallels, but they've gone in their own directions since. Where Radiohead goes for subtlety, Muse goes for rock operas. While the first two albums (Pablo Honey and The Bends) do very little for me, I have a soft spot for a lot of Radiohead's sadder-sounding material (e.g. Videotape, Climbing up the Walls, Sail to the Moon, Codex).