In evaluating the success of twenty-first-century applications of surround sound technology, the popular press often fails to take into consideration the powerful role that history plays in their design. Dolby Atmos for Cinema (2012 –) has been marketed as groundbreaking and become a gold standard in cinema sound. Conceived of as a means to create a “platform” that would reach across the movie theatre, home theatre, music, and virtual reality for maximal profit, however, Atmos was always designed to move beyond it. Discussing both Atmos for Cinema and Atmos for Music (2016–), and drawing on first-hand interviews with industry insiders, this chapter situates Dolby’s platform into a longer history of multimedia surround technologies, and argues that its contribution to that history is first, in its reflection of the underrecognized hybridity of surround sound’s past, and second, to think of surround sound as a space to physically move through.