James Blake’s Overgrown is indisputably one of the most hauntingly gorgeous albums of the year, and the single “Retrograde” is one of its most compelling standouts. If, like me, you’re curious to see how Blake creates his distinct sound in a live setting, check out the above clip of Blake performing “Retrograde” on Letterman, and make sure you stick around for the part where Dave goes puttering over at the end and asking hilariously befuddled-grandpa questions about what Blake and his band just did.