Ecumene is a word describing the collective traditions and influence of a geographically and historically recognizable culture; in this study, the inhabitants of the Balkan region. In compositions by Dusan Bogdanovic (b.1955), Nikos Mamangakis (b. 1929) and Ian Krouse (b.1956), Balkan ecumene can be heard shaping modern repertoire for the classical guitar. In this study, relevant geography is first outlined, followed by a detailed investigation of how specific Balkan rhythms, melodies, and harmonies are used in selected works by these composers. The works are: Six Balkan Miniatures by Bogdanovic;, Hassapiko and Tsifteteli from Folk Dance Suite by Mamangakis, and Variations on a Moldavian Hora by Krouse. An exploration of other academic study into musical synthesis gives context to the blending of Eastern European folk music and Western classical art music found here.