Please demonstrate where in the sacrificial system prior to David that the Levitical priesthood was ordained to rejoice with singing accompanied by instruments. There is a distinction. The scripture I quoted clearly associates what types and shadows were abrogated. The Davidic custom of rejoicing and singing accompanied by music has not been abrogated; it has been expanded into the priesthood of believers. Thus the aposlte's mandate that we utilize David's Psalms as our guide for NT worship.