OK, another composer riddle. This one, known to his compatriots as 'the Hyena', was active both in ethnomusicology and in early electronic music (but also wrote for orchestra and classical ensembles). In front of me lies a Kent State University monograph on his life and work claiming that he worked with 'all the giants' of 20th-century music and was performed in all major concert halls. What intrigued me once, was that in his early years, in the capital of his country,* he met Béla Bartók - whose example he followed in his own ethnomusicological undertakings.
* a big city, nowadays a metropolis (I visited it last year again and in the past bought cds there by this national composer, at the Opera)