im ert ▁and ▁the ▁phys ic ist ▁Werner ▁Meyer - E pp ler , ▁was ▁based ▁sole ly ▁on ▁electron ically ▁generated ▁( syn th etic ) ▁sounds , ▁particularly ▁s ine ▁waves ▁( ; ▁; ▁). ▁The ▁beginning ▁of ▁the ▁development ▁of ▁electronic ▁music ▁has ▁been ▁trac ed ▁back ▁to ▁" the ▁in vention ▁of ▁the ▁val ve ▁[ v acu um ▁t ube ] ▁in ▁ 1 9 0 6 " ▁. ▁The ▁precise ▁control ▁afford ed ▁by ▁the ▁studio ▁allowed ▁for ▁what ▁E im ert ▁considered ▁to ▁be ▁the ▁sub jection ▁of ▁everything , ▁" to ▁the ▁last ▁element ▁of ▁the ▁single ▁note ", ▁to ▁serial ▁permut ation , ▁" result ing ▁in ▁a ▁completely ▁new ▁way ▁of ▁compos ing ▁sound " ▁; ▁in ▁the ▁studio , ▁serial ▁operations ▁could ▁be ▁applied ▁to ▁elements ▁such ▁as ▁tim bre ▁and ▁dynamics . ▁The ▁common ▁link ▁between ▁the ▁two ▁schools ▁is ▁that ▁the ▁music ▁is ▁recorded ▁and ▁performed ▁through ▁loud spe akers , ▁without ▁a ▁human ▁perform er . ▁The ▁majority ▁of ▁electro ac oust ic ▁pieces ▁use ▁a ▁combination ▁of ▁recorded ▁sound ▁and ▁synth es ized ▁or ▁processed ▁sounds , ▁and ▁the ▁sch ism ▁between ▁Sch a ef fer ' s ▁and ▁E im ert ' s ▁approaches ▁has ▁been ▁overcome , ▁the ▁first ▁major ▁example ▁being ▁Karl hein z ▁Stock hausen ' s ▁Ges ang ▁der ▁J üng ling e ▁of ▁ 1 9 5 5 – 5 6 ▁( ; ▁). ▁ ▁Sound ▁generation ▁techniques ▁All ▁electro ac oust