▁in ▁North ▁America ▁and ▁Europe . ▁The ▁magazine ▁was ▁never ▁subs id ized ▁or ▁fund ed ▁by ▁any ▁institution . ▁▁ ▁Music ▁content ▁ ▁Despite ▁or ▁thanks ▁to ▁its ▁short ▁existence , ▁the ▁scope ▁of ▁Source ▁magazine ▁appears ▁both ▁focused ▁and ▁wide ▁r anging . ▁Emer ging ▁from ▁a ▁re jection ▁of ▁formal ▁concert ▁performance ▁and ▁traditional ▁music ▁notation , ▁Source ▁also ▁included ▁performance ▁art ▁and ▁sound ▁poetry ▁in ▁its ▁coverage ▁of ▁avant gar de ▁graph ic ▁scores , ▁therefore ▁expand ing ▁the ▁very ▁definition ▁of ▁music . ▁It ▁wel com ed ▁veter ans ▁like ▁Harry ▁Part ch , ▁L uk as ▁F oss , ▁John ▁C age ▁or ▁Mort on ▁Feld man , ▁as ▁well ▁as ▁young ▁Tur ks ▁of ▁the ▁avant - gar de ▁like ▁Hugh ▁Dav ies ▁( b 1 9 4 3 ), ▁Daniel ▁L ent z ▁( b 1 9 4 2 ) ▁or ▁Jerry ▁H unt ▁( b 1 9 4 3 ). ▁ ▁Over ▁the ▁years , ▁Source ▁covered ▁West ▁Coast ▁experimental ism ▁of ▁the ▁ 1 9 6 0 s ▁( G ordon ▁M um ma , ▁Robert ▁Ash ley ) ▁; ▁American ▁Min imal ism ▁( Ste ve ▁Reich , ▁Christian ▁Wol ff , ▁Ear le ▁Brown ) ▁; ▁the ▁birth ▁of ▁Sound ▁Art ▁as ▁we ▁know ▁it ▁( Al vin ▁Lu cier , ▁Max ▁Neu haus , ▁Anne a ▁Lock wood ) ▁; ▁impro vised ▁and ▁ind et erm inate ▁music ▁( the ▁ON CE ▁Group , ▁Mus ica ▁E let tr onica