For number 1 the answer is c (dissonant). And for number 2 the answer is a (the piece had a different melody for each verse.
Seriously you want us to write you an entire essay?! What are you on because if your acting like this I need some of it.
A gusset is a triangular or square piece of fabric inserted into a seam to add breadth or reduce stress from tight-fitting clothing.
I have experience with music a lot but I can't answer it its not easy sorry
