Sheldon Harnick, a Broadway lyricist whose creative partnership with composer Jerry Bock led to some of the most enduring scores in American musical theater history, notably “Fiddler on the Roof,” died June 23 at his home in Manhattan. He was 99. His publicist Sean Katz confirmed the death but did not cite a cause. Starting in the late 1950s, Mr. Harnick and Bock spent a dozen years at the summit of Broadway songwriting teams.