Which art form became hugely popular between the 1930s and 1960s and led to the creation of subgenres such as superheroes and science fiction?

A. what should the time signature be for the b. every note in this example is (write the letter name.) c. circle all eighth notes. d. how many beats does the rest in the first measure get? e. give the example a final barline. bonus: include a dynamic marking of your choice.