▁By ▁the ▁time ▁of ▁his ▁return ▁to ▁Norway , ▁in ▁ 1 8 8 4 , ▁he ▁had ▁already ▁written ▁a ▁number ▁of ▁works . ▁ ▁Sch jel der up ▁was ▁introduced ▁to ▁the ▁work ▁of ▁Richard ▁Wagner ▁while ▁in ▁Paris , ▁and ▁went ▁to ▁Germany ▁for ▁further ▁expos ure ▁to ▁his ▁work . ▁ ▁This ▁in ▁turn ▁inspired ▁him ▁to ▁write ▁oper as , ▁which ▁were ▁to ▁prove ▁the ▁bulk ▁of ▁his ▁output , ▁though ▁he ▁also ▁composed ▁a ▁number ▁of ▁orch est ral ▁and ▁chamber ▁works . ▁ ▁He ▁also ▁wrote ▁on ▁music ▁for ▁Norwegian ▁publications , ▁and ▁wrote ▁bi ograph ies ▁of ▁Ed vard ▁Gr ieg ▁and ▁of ▁Wagner . ▁ ▁In ▁ 1 9 2 1 ▁together ▁with ▁Ole ▁M ør k ▁Sand vik , ▁he ▁published ▁Nor sk ▁folk em us ik , ▁s æ rl ig ▁ Ø st land sm us ik ken ▁which ▁was ▁the ▁first ▁history ▁of ▁Norwegian ▁ ▁music . ▁ ▁Sch jel der up ▁was ▁among ▁the ▁found ers ▁of ▁the ▁Norwegian ▁Society ▁of ▁Compos ers ▁( N or sk ▁kom pon ist for ening ) ▁in ▁ 1 9 1 7 , ▁and ▁from ▁that ▁year ▁until ▁ 1 9 2 0 ▁served ▁as ▁its ▁chairman . ▁ ▁He ▁continued ▁to ▁promote ▁Norwegian ▁music ▁despite ▁living ▁abroad ; ▁he ▁died ▁at ▁Bened ikt be u ern ▁in ▁Bav aria , ▁Germany ▁during ▁ 1 9 3 3 . ▁ ▁Oper as ▁ ▁Aust an f y re ▁sol ▁og ▁vest an