POINTERLIST_INSTANTIATE(Audio_item);
POINTERLIST_INSTANTIATE(Audio_staff);
POINTERLIST_INSTANTIATE(Paper_column);
POINTERLIST_INSTANTIATE(Paper_score);
POINTERLIST_INSTANTIATE(Audio_item);
POINTERLIST_INSTANTIATE(Audio_staff);
POINTERLIST_INSTANTIATE(Paper_column);
POINTERLIST_INSTANTIATE(Paper_score);