Members of the audience wear 3d glasses while watching German electronic band Kraftwerk perform with a 3d stage set at the Tate Modern in London

Members of the audience wear 3d glasses while watching German electronic band Kraftwerk perform with a 3d stage set at the Tate Modern in London February 6, 2013. REUTERS/Luke MacGregor (BRITAIN – Tags: ENTERTAINMENT TPX IMAGES OF THE DAY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS