Final answer:
Concert overtures were instrumental compositions performed by an orchestra at the beginning of a concert. They were not performed on stage with actors and scenery.
Step-by-step explanation:
The statement in the question is false. Concert overtures were not performed on stage with actors and scenery. Instead, concert overtures were purely instrumental compositions performed by an orchestra at the beginning of a concert or musical performance. They were often based on literary themes, but they were not accompanied by actors or scenery.