Steve Swallow switched from acoustic bass to bass guitar in 1970, and hasn't looked back. Klaus Muempfer/Courtesy of the artist hide caption

itoggle caption Klaus Muempfer/Courtesy of the artist

An unidentified Union soldier holds a banjo. Library of Congress/via Flickr hide caption

itoggle caption Library of Congress/via Flickr

Bun B getting ready to take the stage with the Houston Symphony two days after this interview took place. Courtesy of Marco Torres hide caption

itoggle caption Courtesy of Marco Torres

Foreverly, a new album from Norah Jones and Green Day's Billie Joe Armstrong, was released today. Marina Chavez/Courtesy of the artist hide caption

itoggle caption Marina Chavez/Courtesy of the artist

The new Disney film Frozen is the tale of sisters Anna and Elsa, whose relationship is captured in music by songwriters Robert Lopez and Kristen Anderson-Lopez. Courtesy of Walt Disney Pictures hide caption

itoggle caption Courtesy of Walt Disney Pictures

Grammy Award-winner Esperanza Spalding in her video 'We Are America." ESPLLC hide caption

itoggle caption ESPLLC

Benjamin Britten takes a cup of tea during rehearsals for his War Requiem at Coventry Cathedral, in Coventry, England in May, 1962. Erich Auerbach/Getty Images hide caption

itoggle caption Erich Auerbach/Getty Images