▁a ▁rain bow - color ed ▁c ello ph ane ▁overlay ,, ▁and ▁these ▁were ▁eventually ▁followed ▁by ▁versions ▁with ▁a ▁color ▁monitor ▁and ▁an ▁electron ically - generated ▁color ▁overlay . ▁ ▁Music ▁ ▁Despite ▁its ▁simplicity , ▁the ▁music ▁to ▁Space ▁Inv aders ▁was ▁revolution ary ▁for ▁the ▁g aming ▁industry ▁of ▁the ▁time . ▁Video ▁game ▁scholar ▁Andrew ▁Sch art mann ▁ident ifies ▁three ▁aspects ▁of ▁the ▁music ▁that ▁had ▁a ▁significant ▁impact ▁on ▁the ▁development ▁of ▁game ▁music : ▁ ▁Where as ▁video ▁game ▁music ▁prior ▁to ▁Space ▁Inv aders ▁was ▁restricted ▁to ▁the ▁extrem ities ▁( i . e ., ▁a ▁short ▁intro duct ory ▁theme ▁with ▁game - over ▁counter part ), ▁the ▁al ien - in sp ired ▁hit ▁featured ▁continuous ▁music — the ▁well - known ▁four - note ▁loop — through out , ▁un inter rupted ▁by ▁sound ▁effects : ▁" It ▁was ▁thus ▁the ▁first ▁time ▁that ▁sound ▁effects ▁and ▁music ▁were ▁super im posed ▁to ▁form ▁a ▁rich ▁son ic ▁landscape . ▁Not ▁only ▁do ▁players ▁receive ▁feedback ▁related ▁directly ▁to ▁their ▁actions ▁through ▁sound ▁effects ; ▁they ▁also ▁receive ▁stim ulus ▁in ▁a ▁more ▁subt le , ▁non - inter active ▁fashion ▁through ▁music ." ▁ ▁The ▁music ▁interact s ▁with ▁on - screen ▁animation ▁to ▁influence ▁the ▁emot ions ▁of ▁the ▁player : ▁" That ▁seem ingly ▁ped est rian ▁four - note ▁loop ▁might ▁stir ▁us ▁in ▁the ▁most ▁primitive ▁of ▁ways , ▁but ▁that ▁it ▁st irs ▁us