“…The main thrust of rhythm research in comparative musicology and ethnomusicology has been to emphasize the dramatic range of cultural diversity and difference, not only in their surface rhythms, but also in the metrical systems that function as frameworks for their rhythm perception and production. It is empirically evident that music in many parts of the world makes structural usage of non-isochronous beats, including northern Europe (Kvifte, 2007 ; Johansson, 2009 ; Haugen, 2014 ), south-east Europe (Brăiloiu, 1984 ; Moelants, 2006 ; Goldberg, 2015 ; Polak, 2015 ), Turkey (Cler, 1997 ; Bates, 2011 ; Holzapfel, 2015 ; Reinhard et al, 2015 ), Egypt and the Arab world (Marcus, 2001 , 2007 ), Central Asia (During, 1997 ), India (Clayton, 1997 , 2000 ), and parts of Africa and its diasporas (Gerischer, 2003 , 2006 ; Polak, 2010 ; Jankowsky, 2013 ; Haugen and Godøy, 2014 ; Polak and London, 2014 ). Both isochronous and non-isochronous beats co-exist in most, if not all, of these regions.…”