Why does music written in a minor key sound "sad" or "downbeat," while music in a major key sounds "happy" or "upbeat"?

Match the description to the term. 1. framework of a short story narration 2. main idea of a paragraph plot 3. connectors between sentences assonance 4. sentence completers setting 5. repetition of vowel sounds that are followed by different consonants complements 6. time, place, culture in a story run-on sentence 7. conversation between characters in a story transitional devices 8. relating of actions and incidents in a story topic sentence 9. two or more unrelated thoughts dialogue