The poem
Speech after long silence; it is right, All other lovers being estranged or dead, Unfriendly lamplight hid under its shade, The curtains drawn upon unfriendly night, That we descant and yet again descant Upon the supreme theme of Art and Song: Bodily decrepitude is wisdom; young We loved each other and were ignorant.
Perhaps the "supreme theme"= Art and Song, or ambiguous
y, there might be a "supreme theme" which Art and Song celebrate. If so, that theme might be Love, or Death, or both.