This chapter is focused on the transnational influences of Japanese music during the Cold War and on music’s role in U.S. cultural diplomacy efforts aimed at Japan. This includes examples of numerous American jazz musicians (David Brubeck, Duke Ellington, Herbie Mann) who were sent to Japan and who created musical “impressions” of their experience. A primary focus in on the 1961 Tokyo East-West Music Encounter organized by Nicolas Nabokov and attended by multiple American composers (Lou Harrison, Henry Cowell, Colin McPhee) and scholars (Robert Garfias). The chapter then details the broad influence of gagaku on European (Messiaen, Stockhausen, Xenakis) and American composers, focusing particularly on Alan Hovhaness. Experimental composers, such as Richard Teitelbaum, inspired by John Cage’s engagement with Zen also turned toward Japan. The chapter concludes with an extended discussion of the role of Japanese music and Japanese composers (particularly Toru Takemitsu) in the career of Roger Reynolds.