▁at ▁all ▁is ▁worthy ▁of ▁note . ▁By ▁demonstr ating ▁that ▁game ▁sound ▁could ▁be ▁more ▁than ▁a ▁simple ▁t une ▁to ▁fill ▁the ▁silence , ▁Space ▁Inv aders ▁moved ▁video ▁game ▁music ▁closer ▁to ▁the ▁real m ▁of ▁art ." ▁ ▁The ▁music ▁for ▁Space ▁Inv aders ▁popular ized ▁the ▁notion ▁of ▁vari ability — the ▁idea ▁that ▁music ▁can ▁change ▁in ▁accord ance ▁with ▁the ▁on going ▁on - screen ▁narr ative . ▁The ▁variable ▁in ▁Space ▁Inv aders , ▁the ▁tempo , ▁is ▁admitted ly ▁simple , ▁but ▁its ▁imp lications ▁are ▁not ▁to ▁be ▁under est im ated . ▁" Over ▁the ▁years , ▁analog ous ▁strateg ies ▁of ▁variation ▁would ▁be ▁applied ▁to ▁pitch , ▁rh ythm , ▁dynamics , ▁form , ▁and ▁a ▁host ▁of ▁other ▁parameters , ▁all ▁with ▁the ▁goal ▁of ▁accommod ating ▁the ▁non linear ▁aspect ▁of ▁video ▁games ." ▁ ▁Next ▁Generation ▁editor ▁Neil ▁West ▁also ▁c ited ▁the ▁Space ▁Inv aders ▁music ▁as ▁an ▁example ▁of ▁great ▁video ▁game ▁art , ▁comment ing ▁on ▁how ▁the ▁simple ▁mel ody ' s ▁increasing ▁tempo ▁and ▁synchron ization ▁with ▁the ▁enemies ' ▁movement ▁ch ills ▁and ▁exc ites ▁the ▁player . ▁ ▁Sales ▁and ▁ports ▁ ▁In ▁the ▁first ▁few ▁months ▁following ▁its ▁release ▁in ▁Japan , ▁Space ▁Inv aders ▁became ▁popular . ▁Special ty ▁arc ades ▁opened ▁with ▁nothing ▁but ▁Space ▁Inv aders ▁cabin ets , ▁and ▁by ▁the ▁end ▁of ▁ 1 9 7 8 ▁T ait o ▁had ▁installed ▁over ▁