A. a style of jazz developed in Harlem.
One of the things that helps in determining that “boogie-woogie”
refers to a style of jazz developed in Harlem is the third word of the first
line—“daddy.” What daddy is referring to
is the term “daddy-o,” which was a term for a male commonly used in the jazz
era in the Harlem area among others, but its origin is certainly attributed to the jazz
culture.
John Brown was an American abolitionist who advocated insurrection as a means to end slavery in the United States. For his activities outside the law, Brown was accused of treason against the Commonwealth of Virginia, found guilty and hanged.
Prior to his death and after his sentencing, a large number of prominent figures raised money and wrote speeches in his defense. One of this people was Ralph Waldo Emerson. Emerson presented Brown as a common, everyday man who had strong ideals and felt compelled to act upon them. This was intended to present Brown as an admirable man and to invoke sympathy among the people by identifying themselves with him.
"no woman's heart / So big, to hold so much; they lack retention"
This shows that Orsino doesn't think that women are able to stay constant in love like men (especially himself) can. He says they "lack retention" which means they do not retain the same feelings for a long time like men do.