, ▁particularly ▁in ▁the ▁real m ▁of ▁chamber ▁music , ▁is ▁difficult ▁to ▁trace ▁because ▁of ▁rec ast ing ▁and ▁incorpor ation ▁into ▁new ▁definit ive ▁versions . ▁It ▁is ▁in ▁a ▁way ▁ir onic ▁that ▁such ▁a ▁situation ▁should ▁arise ▁with ▁Hol bro oke ▁of ▁all ▁compos ers , ▁for ▁from ▁the ▁first ▁he ▁gave ▁evidence ▁of ▁order lin ess ▁of ▁mind ▁in ▁listing ▁and ▁design ating ▁his ▁music ▁( e . g . ▁Po em ▁No . 2 , ▁Sym ph onic ▁Quart et ▁No . 1 ); ▁but ▁revis ions , ▁re arr ang ements ▁and ▁res h uff lings ▁led ▁to ▁hav oc ▁from ▁which ▁not ▁even ▁works ▁of ▁later ▁date , ▁when ▁the ▁number ing ▁system ▁might ▁have ▁been ▁expected ▁to ▁have ▁settled ▁down , ▁are ▁ex empt ." ▁ ▁D ram atic ▁ ▁Opera ▁ ▁V aren ka ▁( c . 1 9 0 7 ) ▁[ poss ibly ▁un fin ished , ▁no ▁longer ▁ext ant ▁] ▁ ▁Pier rot ▁and ▁Pier ret te , ▁Op . 3 6 a ▁( 1 9 0 8 ) ▁[ l ater ▁re vised ▁as ▁The ▁Str anger ▁] ▁ ▁D yl an , ▁Son ▁of ▁the ▁W ave , ▁Op . 5 3 ▁( 1 9 0 9 ) ▁[ No . 2 ▁of ▁the ▁cycle ▁The ▁Ca uld ron ▁of ▁Ann wn ] ▁ ▁The ▁Children ▁of ▁Don , ▁Op . 5 6 ▁( 1 9 1 0 – 1 2 ) ▁[ No . 1 ▁of