Q: 1. Why do some parishes stop using musical accompaniment after the Gloria on Holy Thursday until the Gloria at the Easter Vigil?
2. Why is there so much variation as to the “turning on” of the church lights at the Easter Vigil? When should the lights be turned on?
A: I treated these in my book Glory in the Cross.
1. The Roman Missal’s treatment of Holy Thursday’s Mass of the Lord’s Supper says that bells are rung during the Gloria, then then remain silent until the Gloria of the Easter Vigil. Their same rubric (no. 7 in the missal) says that the organ and other instruments may only be used to support singing during the same period.
2. Here’s a previous post: https://paulturner.org/lights-at-easter-vigil/ .