A dirge is a funeral song. Why did Shelley choose that title for this poem?

A Dirge
by Percy Bysshe Shelley

Rough wind, that moanest loud
Grief too sad for song;
Wild wind, when sullen cloud
Knells all the night long;

Sad storm, whose tears are vain,
Bare woods, whose branches strain,
Deep caves and dreary main,--
Wail, for the world's wrong!