Library of Congress

A manuscript of a J.S. Bach cantata casts a new light on how Bach intended the piece to be played. A singer gains insight from a line in a Porgy and Bess manuscript that differs from the final lyrics. The Music Division of the massive Library of Congress in Washington, DC, is a place where performers, composers, scholars and the general public make discoveries of the musical kind.

David Bromberg is best known as a guitar virtuoso, who has collaborated with Bob Dylan and George Harrison and fronted his own band. But he's also a collector of American violins, and his collection is such that the Library of Congress has announced its intention to acquire it. Bromberg started collecting violins in the late 1960s. "As a traveling musician, I'd always go to the violin shops if there were any wherever I was and I'd say, 'I collect good American violins,' he recalls. "As like...