The prosecutor should be happy that it wasn't King David dancing with abandon, (possibly naked) in front of the Ark and everyone...
Look what happened to David's first wife who scolded him- he left her presence forever and she was childless.
I hope this prosecutor realizes that freedom of religion also includes music with drums, bass, electric guitars, etc.
Question: Does he do this with rock concerts?
If not, sounds like favoritism at the least, conspiracy or worse.

Lord, soften his heart towards the freedoms You provide. Worshiping in spirit and in truth is what's important, not instruments that are played. Thank You for these young people who are willing to stand up and be counted, whatever the cost. Bless them, continue to unite them. Let them be seen as peacemakers in this time of conflict. In the Name of Jesus