. ▁He ▁published ▁the ▁song books ▁Sk ol ens ▁vis eb ok ▁() ▁in ▁ 1 9 7 2 ▁( co - ed ited ▁with ▁K lak eg g ▁and ▁L unde ), ▁and ▁Sy ng ▁med ▁() ▁in ▁ 1 9 8 8 . ▁ ▁He ▁co - w rote ▁the ▁bi ography ▁Ed vard ▁Gr ieg ▁– ▁men nes ket ▁og ▁kunst ner en ▁together ▁with ▁D ag ▁Sch jel der up - E bbe ▁in ▁ 1 9 8 0 , ▁a ▁work ▁that ▁has ▁been ▁translated ▁to ▁several ▁languages , ▁including ▁English , ▁German ▁and ▁Russian . ▁( English ▁title ▁Ed vard ▁Gr ieg . ▁The ▁Man ▁and ▁the ▁Art ist ). ▁From ▁ 1 9 8 0 ▁to ▁ 2 0 0 4 ▁he ▁cha ired ▁the ▁committee ▁responsible ▁for ▁publishing ▁the ▁twenty ▁volumes ▁of ▁Gr ieg ' s ▁Collect ed ▁Works . ▁He ▁has ▁edited ▁books ▁on ▁Gr ieg ' s ▁correspond ence , ▁and ▁on ▁Gr ieg ' s ▁di aries . ▁In ▁ 1 9 9 0 ▁he ▁published ▁a ▁bi ographical ▁book ▁on ▁composer ▁Johan ▁Sv ends en , ▁Johan ▁Sv ends en ▁– ▁men nes ket ▁og ▁kunst ner en ▁( ), ▁in ▁co operation ▁with ▁Sch jel der up - E bbe . ▁ ▁He ▁was ▁a ▁fellow ▁of ▁the ▁Norwegian ▁Academy ▁of ▁Science ▁and ▁Let ters ▁from ▁ 1 9 7 9 , ▁the ▁Royal ▁Dan ish ▁Academy ▁of ▁Sciences ▁and ▁Let ters ▁from ▁ 1 9 9 1 ▁and ▁Academia