Tiny Desk Concert with Anonymous 4 on March 4. Emily Jan/NPR hide caption

itoggle caption Emily Jan/NPR

Anonymous 4 With Bruce Molsky

The a cappella quartet, with banjo and fiddle, offers popular songs from the Civil War era.

Carlos Waters/NPR

Punch Brothers

Before the wide-ranging band plays, the audience sings "Happy Birthday" to mandolinist Chris Thile.

Colin Marshall/NPR

Aurelio

Aurelio weaves intricate layers of acoustic guitar to capture the feel of African and the Caribbean.

Morgan McCloy/NPR

Phox

The Wisconsin band performs three of its warm, accessible songs in the NPR Music offices.

Colin Marshall /NPR

Zola Jesus

With her huge voice and an assist on trombone, Nika Roza Danilova offers up a curious combination.