▁in ▁use ▁by ▁ 1 9 4 7 , ▁while ▁final ▁touch es ▁were ▁still ▁being ▁added . ▁ ▁Os lo ▁City ▁Hall ▁was ▁officially ▁opened ▁on ▁ 1 5 ▁May ▁ 1 9 5 0 , ▁as ▁part ▁of ▁the ▁city ' s ▁ 9 0 0 - year ▁anni versary . ▁ ▁Three ▁musical ▁compos itions ▁were ▁written ▁in ▁connection ▁with ▁the ▁celebr ations , ▁written ▁by ▁Lud v ig ▁Ir gens - J ensen , ▁E iv ind ▁Gro ven ▁and ▁Karl ▁Anders en . ▁ ▁By ▁the ▁time ▁it ▁opened ▁in ▁ 1 9 5 0 , ▁the ▁style ▁of ▁the ▁building ▁was ▁no ▁longer ▁popular . ▁ ▁Br ick ▁was ▁in ▁stark ▁contrast ▁to ▁the ▁steel ▁and ▁glass ▁which ▁architect s ▁considered ▁modern ▁at ▁the ▁time , ▁and ▁no ▁further ▁buildings ▁were ▁built ▁in ▁that ▁style ▁afterwards . ▁ ▁Stockholm ' s ▁city ▁hall ▁- ▁also ▁in ▁brick ▁- ▁had ▁been ▁designed ▁by ▁R agn ar ▁Ö st berg , ▁and ▁Martin ▁Ny rop ▁designed ▁C open hagen ▁City ▁Hall , ▁which ▁is ▁also ▁a ▁monument al ▁brick ▁building . ▁ ▁Both ▁Ny rop ▁and ▁Ö st berg ▁were ▁on ▁the ▁j ury ▁which ▁selected ▁the ▁winning ▁design ▁of ▁Os lo ▁City ▁Hall . ▁ ▁Dec oration ▁Vari ous ▁cont ests ▁were ▁held ▁to ▁decide ▁who ▁would ▁decor ate ▁City ▁Hall ▁in ▁January ▁ 1 9 3 7 . ▁In ▁all , ▁eight ▁pain ters ▁and ▁ 1 7 ▁sculpt ors ▁were ▁h ired . ▁ ▁Most ▁of