Theory:

This poem is about wandering singers. They are a band of musicians who wander from place to place singing songs that carry a message; they do not have a home or any fixed place of stay.
 
The singers feel that the sound of the wind invites them to forests and streets. That is their call to start their musical journey. They hear the sounds repetitively as it keeps ringing in their ears.
 
*Click to hear the sound of the winds.
 
The wandering singers carry many instruments in their hands, one of which is the lute. A lute is similar to a mandolin. They roam around singing songs with their lutes. They treat everybody they meet as their own family or relations, as they do not have a particular family or home. The whole wide world is their home.
 
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A wandering singer with her lute!
  
The wandering singers adopt themes for their songs about cities whose glorious past have been forgotten; about the past lives of noble, happy and beautiful women; about mighty battles and the kings who fought with bravery; finally they also sang about happy, simple and sorrowful day-to-day matters that touched everyone's hearts.
 
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Themes included ancient cities, noble women, glorious sword battles, happiness and sorrow!
  
The poet conveys that their songs covered many subjects like beauty, history, glory, bravery and happiness.
 
The wandering singers do not hope or plan for the future like others. They do not have great dreams as they live life as it comes. They go wherever the wind leads them.
 
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They walk in the direction of the wind - no fixed destination or destiny!
  
They do not have a fixed destiny nor do they know where they are going. There is nothing that can make them stay in a place. There is nobody waiting for them. There is no love or happiness that can be offered to them to make them move. Their destiny changes according to the direction of the winds.
 
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The voice of the wind is the voice of their fate!
Reference:
*Sound courtesy: https://www.freesoundeffects.com/free-track/windhowl-428704/