For more than 45 years, the legendary John Prine has written some of the most powerful lyrics in the American music canon. He brings some of his best to this unforgettable Tiny Desk performance.

Tyler Childers writes songs about hard lives and hard love with direct heart and a soulful Kentucky drawl.

Watch the rising U.K. star perform intimate renditions of "Blue Lights," "On My Mind" and "Teenage Fantasy" with a full band.

The Icelandic composer is joined by two "ghost" pianists, making mysterious and memorable music at the Tiny Desk.

As she settled in for this stripped-down set, Taylor Swift looked out over the office. "I just decided to take this as an opportunity to show you guys how the songs sounded when I first wrote them."