Frank Sinatra captured by photographer William "PoPsie" Randolph during a 1943 concert. Author Ben Yagoda points to Sinatra as one of the interpreters who helped revive the Great American Songbook. William "PoPsie" Randolph/Courtesy of Riverhead hide caption

itoggle caption William "PoPsie" Randolph/Courtesy of Riverhead

Tony Bennett and Lady Gaga perform "The Lady Is a Tramp" together on Bennett's new album, Duets II, out Sept. 20. Courtesy of the artist. hide caption

itoggle caption Courtesy of the artist.