micropolyphony
/ˌmʌɪkrə(ʊ)pəˈlɪfəni/Music
noun
The compositional style chiefly associated with the Hungarian-born composer György Ligeti (1923–2006), and characterized by multiple intricate polyphonic parts.
Origin
1970s; earliest use found in The Listener. From micro- + polyphony, after German Mikropolyphonie (apparently coined by György Ligeti).