The form of art depends on the message the artist wants to convey.
hope this helps
The event that most likely due to the 1860 presidential election of Lincoln was The Secession Of Carolina From The Union.
Basically to Ahab there exists something more behind the world some kind of neo-Platonic aspect. He thinks there is an unknown reasoning behind the mask of all visible things, what that is can be any man's guess but to Ahab whatever it is, it is nothing less then vengeful.
I’m guessing it wants you to fill in two major key signatures like D major and C major also with two minor key signatures like A minor and B minor. I picked those key signatures because A minor is the same as C major but it starts on A and D major and B minor is the same but it starts on B