State the possible meanings for the word "blues" in the title and relate this to the poem itself.

The word “blues” in the poem’s title refers to blues music, a genre of music invented by African Americans associated with communal sadness and specific sounds. Blues music is often played, or sung, as a means of soothing or ameliorating the sorrows of the singers, musicians, or audience. This is relevant to Auden’s poem, which is an elegy for a lost loved one. The poem seems to have been written as a way for Auden to process, and cope with the loss of a man he describes in the poem as “my North, my South, my East and West.”
The poem is also written in rhyming couplets (“West . . . rest," "song . . . wrong”), which lends a musicality and rhythm to the poem, reflecting the rhythm of traditional blues music. In fact, traditional blues music is characterized by repeating chord progressions and cycles, and this repetitive rhythm is echoed by the repeating couplets in Auden's poem.