Sister Act 2: Back in the Habit(1993)
The sisters come back to Delores's show to get her back as Sister Mary Clarence to teach music to a group of students in their parochial school which is doomed for closure. One of the girls, who is the most talented of the bunch, is forbidden to sing by her mother, although the choir has made it to the state championship. A group of stereotypical incompetent monks tries to stop them.
This trailer was originally posted to YouTube by TheTrailerGal.