▁prom oting ▁the ▁cho ir ▁and ▁its ▁events . ▁ ▁The ▁largest ▁cho ir ▁has ▁typically ▁been ▁the ▁Con cert ▁Ch oir . ▁En roll ment ▁in ▁this ▁Ch oir ▁has ▁been ▁as ▁high ▁as ▁ 1 3 0 ▁members , ▁and ▁currently ▁ ▁has ▁approximately ▁ 1 0 0 . ▁ ▁The ▁vocal ▁music ▁program ▁at ▁North western ▁is ▁not ▁considered ▁extra - curr icular . ▁All ▁cho irs ▁at ▁North western ▁are ▁offered ▁as ▁credit ▁courses ▁during ▁the ▁academic ▁school ▁day . ▁ ▁The ▁M ixed ▁Ch orus ▁was ▁begun ▁in ▁the ▁ 2 0 1 3 - 1 4 ▁school ▁year . ▁It ▁is ▁open ▁to ▁all ▁students ▁in ▁gr ades ▁nine ▁through ▁twelve , ▁and ▁ ▁is ▁intended ▁to ▁be ▁the ▁beginning - level ▁cho ir ▁for ▁those ▁students ▁with ▁little ▁to ▁no ▁prior ▁experience ▁in ▁vocal ▁music ▁performance . ▁ ▁The ▁Con cert ▁Ch oir ▁is ▁the ▁intermediate - level ▁cho ir ▁and ▁the ▁main ▁vocal ▁performing ▁group ▁at ▁North western , ▁for ▁students ▁in ▁gr ades ▁nine ▁through ▁twelve . ▁It ▁has ▁open ▁en roll ment . ▁Stud ents ▁sing ▁in ▁many ▁gen res , ▁such ▁as ▁classical , ▁spiritual , ▁international , ▁sec ular , ▁sacred , ▁jazz , ▁and ▁show ▁t unes . ▁The ▁cho ir ▁has ▁performed ▁classical ▁works , ▁from ▁Moz art ▁and ▁Sch ub ert , ▁to ▁challeng ing ▁spiritual s ▁by ▁William ▁L . ▁Daw son ▁and ▁Mos es ▁Hog an . ▁ ▁The ▁Advanced ▁Ens emble ▁is ▁an ▁aud ition