Electronic music, then and now: Milton Babbitt, avant-gardist of the 1950s, needed a room full of equipment to create his works; for Tod Machover, a composer at the forefront of music/technology mixes today, a desktop and keyboard might suffice. Top: William Gedney Photographs and Writings, Duke University David M. Rubenstein Rare Book & Manuscript Library, http://library.duke.edu/digitalcollections/gedney/. Bottom: Boston Globe via Getty Images.