Bob Boilen

It's as if the pianos were haunted. Somewhere about midway through this Tiny Desk, as Icelandic composer Ólafur Arnalds performed on his electronic keyboard, two upright pianos were playing lilting melodies behind him, absent any performer at the keys. And yet these "ghosts," along with Ólafur's band of strings and percussion, put together some of the most beautiful music I've heard at the Tiny Desk, made all the more mysterious through its presentation.

Note: NPR's First Listen audio comes down after the album is released. However, you can still listen with the Spotify or Apple Music playlist at the bottom of the page.

NOTE: Each day this week we'll be rolling out a series of videos from Sylvan Esso that comprise the duo's upcoming visual EP, Echo Mountain Sessions.

We watched more than 6,000 videos. Ten judges weighed in. Now, the 2017 Tiny Desk Contest has a winner.

Ask a Bruce Springsteen fan about the holy grails of his concerts and you're likely to hear about a 1980 Tempe, Ariz. show. Today NPR Music has video of Springsteen performing "The River" from that very concert. The brilliant performance — or at least much of it — was recorded using four cameras and a multitrack machine for audio. It's all been put together and is being released 35 years later as part of a new box set called The Ties That Bind: The River Collection.

Brian Burton has good taste. As Danger Mouse, he's won five Grammy Awards and worked with everyone from the Black Keys to Gorillaz to Adele. Now the musician, songwriter and producer is adding another impressive project to his resume: his own record label.

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