▁are ▁of ▁primary ▁importance ▁in ▁mel od ies , ▁the ▁contemporary ▁music ▁of ▁the ▁ 2 0 th ▁and ▁ 2 1 st ▁centuries ▁pitch ▁and ▁duration ▁have ▁less ened ▁in ▁importance ▁and ▁quality ▁has ▁gained ▁importance , ▁often ▁primary . ▁Ex amples ▁include ▁musique ▁conc r ète , ▁k lang far ben mel od ie , ▁Elli ott ▁Carter ' s ▁E ight ▁Et udes ▁and ▁a ▁Fant asy ▁( which ▁contains ▁a ▁movement ▁with ▁only ▁one ▁note ), ▁the ▁third ▁movement ▁of ▁Ruth ▁C raw ford - Se eg er ' s ▁String ▁Quart et ▁ 1 9 3 1 ▁( l ater ▁re - orch estr ated ▁as ▁And ante ▁for ▁string ▁or chestra ), ▁which ▁creates ▁the ▁mel ody ▁from ▁an ▁un ch anging ▁set ▁of ▁pitch es ▁through ▁" d isson ant ▁dynamics " ▁alone , ▁and ▁Gy ör gy ▁Lig eti ' s ▁A vent ures , ▁in ▁which ▁rec urr ing ▁ph on et ics ▁create ▁the ▁linear ▁form . ▁ ▁See ▁also ▁▁ ▁H ocket ▁ ▁Par s ons ▁code , ▁a ▁simple ▁notation ▁used ▁to ▁identify ▁a ▁piece ▁of ▁music ▁through ▁mel od ic ▁motion — the ▁motion ▁of ▁the ▁pitch ▁up ▁and ▁down . ▁ ▁Se quence ▁( music ) ▁ ▁Un ified ▁field ▁ ▁References ▁ ▁Further ▁reading ▁ ▁Ap el , ▁Will i . ▁Harvard ▁Dictionary ▁of ▁Music , ▁ 2 nd ▁ed ., ▁pp .   5 1 7 – 1 9 . ▁Edwards , ▁Arthur ▁C . ▁The ▁Art