Why did shelley choose dirge for a funeral song?

What is the most likely purpose for the poem? to compare a physical journey to life to describe family conflicts to compare human behavior to the experience of exploring nature to show how our daily lives are filled with danger the journey poem

"spring, the sweet " from summer's last will and testament spring, the sweet spring, is the year's pleasant king, then blooms each thing, then maids dance in a ring, cold doth not sting, the pretty birds do sing: cuckoo, jug-jug 1 , pu-we, to-witta-woo! the palm2 and may3 make country houses gay, lambs frisk and play, the shepherds pipe4 all day and we hear aye5 birds tune this merry lay6: cuckoo, jug-jug, pu-we, to-witta-woo! the fields breathe sweet, the daisies kiss our feet, young lovers meet, old wives a-sunning sit, in every street these tunes our ears do greet: cuckoo, jugjug, pu-we, to-witta-woo! spring, the sweet spring! –thomas nashe jug-jug: sound of the nightingale palm: willow may: hawthorn pipe: play a shepherd's flute aye: always lay: song choose the sense that the poet appeals to in the last two lines of each stanza.

Describe the situation precisely what time of day and year is it where is the speaker what is happening to the weather