A few weeks ago, we sized up Sigur Rós' forthcoming Valtari, a pretty, understated affair harboring a keen focus on detail. Only lead single "Ekki Múkk" (as well as B-side "Kvistur") have made the rounds publicly, and now the swelling "Varúð" has made its debut on Shaun Keaveny's BBC Radio 6 show. Stream it below. (via Over Muziek) Valtari is ...