Giovanni Paolo Panini – A musical celebration given the Cardinal Rochefoucauld at the Teatro Argentina in Rome, July 15, 1747, on the occasion of the wedding of the Dauphin Louis XV and Marie-Josephe of Saxony. Part 2 Louvre

The picture has something of this: church, architecture, temple, ornate, sculpture, ancient, castle, cathedral, turning point, ceiling, spirituality, religious, decoration, worship.
Perhaps it’s a painting of a large auditorium with a lot of people on the stage and in the middle of the room there is a stage full of people.