Simplify the following text for a Grade 5 native English-speaking person.
Original: These works are for narrator and full orchestra , intended to be broadcast over the radio ( since a human voice would not be able to be heard over the full volume of an orchestra ) .
Simplified: These works are for a speaker and a full orchestra . These were written to be played over the radio because a human voice would not be able to be heard over the full volume of an orchestra .