??? ????? ????? ???? ???????????? ??? ?????????? ?????? ????? ????? ??????? ??????????????.Emphasising the necessity of Yamaha’s DX7, composer and MusicRadar journalist OSC Steve argued: “it’s probable to categorise 1980s music into two eras; the pre-DX7 period and the write-up-DX7 period, this sort of was the popular use of the new instrumen