Tom ColeTom Cole is a senior editor on NPR's Arts Desk.
Charley Patton was the grandaddy of the Delta blues musicians, according to Jack White: "He's the one that all the other blues musicians looked up to. He's almost the beginning of the family tree."
Courtesy of the Revenant Archives
King Oliver's Creole Jazz Band in Chicago in 1923: Louis Armstrong is kneeling, from left to right behind him are Honore Dutrey, Baby Dodds, King Oliver, Lil Hardin, Bill Johnson and Johnny Dodds.
Frank Driggs Collection/Getty Images
A 16-inch lacquer disc, a format used in the 1930s, from the collection of the Library of Congress. Most of the lacquer, the part of the disc where the sound was etched, has been lost to decay.
Abby Brack/Library of Congress