Becky Lettenberger/NPR

Andrew W.K.

The fearless party-rocker stands in NPR Music's offices and performs four songs alone at the piano.

Zee Avi. Frannie Kelley/NPR hide caption

itoggle caption Frannie Kelley/NPR

Zee Avi

Avi sings three hushed lullabies, including her signature cover of Morrissey's "First of the Gang."

Bowerbirds' captivating set of handcrafted songs has a distinctively sparse, harmonious sound. Bob Boilen/NPR hide caption

itoggle caption Bob Boilen/NPR

Bowerbirds

Bowerbirds' handcrafted songs creak and swell like wooden floorboards in an old house.

Frannie Kelley/NPR

K'naan

The rapper's set exuded shimmery grace while incorporating the sounds of soul, pop and reggae.

Frannie Kelley/NPR

Sondre Lerche

The Norwegian-born singer-songwriter performs three liltingly sweet songs in the NPR Music offices.

Coburn Dukehart

Ralph Stanley

See and hear the legendary bluegrass and old-time gospel singer give an a cappella performance.

Maggie Starbard

Rodrigo y Gabriela

The duo's new album pays tribute to the pair's heroes, such as Jimi Hendrix and Carlos Santana.

Katie Hayes/NPR

Raphael Saadiq

The Grammy-nominated R&B artist performed three acoustic interpretations of his soul-inspired tunes.