Answer: Alcinous is halting the song because Odysseus is crying—again.
This scene occurs while Odysseus is in Phaeacia, in the court of Alcinous. While attending a banquet, the blind bard Demodocus sings of the adventures of Odysseus in Troy. Specifically, he sings of the quarrel between Odysseus and Achilles. However, this song brings sad memories to Odysseus, who starts crying. Seeing how upset his guest is, Alcinous decides to halt the song.
<span>Sustaining paragraph is used in a narrative which sustain interest. This is a paragraph that does not change the tone or theme as it is just constant. The interest is just the same and no rising action is made. It is common in general knowledge and informations that are known to all.</span>
The poem deals with the end of a life, more precisely, he wrote it after his son died. It perfectly fits the role of being a final poem in a collection.</span>