▁critic . ▁He ▁was ▁a ▁professor ▁at ▁the ▁University ▁of ▁Os lo ▁from ▁ 1 9 6 5 ▁to ▁ 1 9 9 8 , ▁and ▁is ▁probably ▁best ▁known ▁for ▁his ▁long - term ▁research ▁on ▁composer ▁Ed vard ▁Gr ieg . ▁ ▁Life ▁and ▁career ▁Ben est ad ▁was ▁born ▁in ▁Krist ians and ▁as ▁the ▁son ▁of ▁Har ald ▁Martin ▁Ben est ad ▁and ▁Ellen ▁K itt elsen . ▁He ▁married ▁In ge ▁Berg li ot ▁Ros end al ▁in ▁ 1 9 5 1 . ▁He ▁graduated ▁in ▁music ology ▁from ▁the ▁University ▁of ▁Os lo ▁in ▁ 1 9 5 3 . ▁He ▁worked ▁as ▁a ▁school ▁teacher ▁in ▁Os lo ▁from ▁ 1 9 5 0 ▁to ▁ 1 9 5 9 , ▁and ▁was ▁assigned ▁a ▁position ▁at ▁the ▁University ▁from ▁ 1 9 6 0 ▁to ▁ 1 9 6 1 . ▁In ▁ 1 9 6 1 ▁he ▁was ▁appointed ▁professor ▁at ▁the ▁Te ach ers ' ▁College ▁( l ater ▁merged ▁into ▁the ▁Norwegian ▁University ▁of ▁Science ▁and ▁Technology ) ▁in ▁Tr ond heim , ▁and ▁from ▁ 1 9 6 5 ▁to ▁ 1 9 9 8 ▁he ▁was ▁a ▁professor ▁at ▁the ▁University ▁of ▁Os lo . ▁ ▁Among ▁his ▁books ▁is ▁a ▁study ▁of ▁composer ▁Johannes ▁Ha ark lou ▁from ▁ 1 9 6 1 , ▁Wal dem ar ▁Th rane ▁from ▁ 1 9 6 1 , ▁and ▁Musik kl æ re ▁() ▁from ▁ 1 9 6 3