The sounds from creatures, water and others remind us how the hills are filled with lives. Each sound reminds us of different emotion that each of us experience in our life.
We may be perhaps frightened at times like the birds when they fly up onto trees. Some days we may feel like to sigh and yet other days we are happy like a brook. Some nights we may be up through the night praying.
When I am lonely I go to the hills since I, perhaps, feel understood that some creature or a stream of water shares my feeling.
My heart is blessed when I hear "the sound of music". (I feel like this is also referring to the "children.") I may have been sad but I can now give my life another try because I know I have my children and because of my love for them.