The popular definition of tragedy is heavy drama in which everyone is killed in the last act, comedy being light drama in which everyone is married in the last act.
Drama is the most difficult of all arts. In it two things are to be satisfied - first, the ears, and second, the eyes. To paint a scene, if one thing be painted, it is easy enough; but to paint different things and yet to keep up the central interest is very difficult. Another difficult thing is stage - management, that is, combining different things in such a manner as to keep the central interest intact.
When I say that I can write nothing but weird fiction, I am not trying to exalt that medium but am merely confessing my own weakness. The reason I can't write other kinds is not that I don't value & respect them, but merely that my slender set of endowments does not enable me to extract a compellingly acute personal sense of interest & drama from the natural phenomena of life.
A third variety of drama ... begins as tragedy with scraps of fun in it ... and ends in comedy without mirth in it, the place of mirth being taken by a more or less bitter and critical irony.
What's interesting to me is drama and conflict. Things aren't interesting without conflict and resolution of conflict - or striving towards a resolutions of conflict.