To dwellers in a wood almost every species of tree has its voice as well as its feature.  At the passing of the breeze the fir-trees sob and moan no less distinctly than they rock; the holly whistles as it battles with itself; the ash hisses amid its quiverings; the beech rustles while its flat boughs rise and fall.  And winter, which modifies the note of such trees as shed their leaves, does not destroy its individuality.

Thomas Hardy, Under the Greenwood tree, chapter one

After reading this quote in the Italian magazine Hera, www.heraedizioni.com/j_hera/, entitled “Musica ancestrale e psicosuoni, I have been somewhat delighted by the awakening that each tree (species and individual) has not only it own outward appearance and its texture, but also its own distinct voice.  It’s obvious when I think about it, but I haven’t really consciously experienced it.

This is something I’m going to enjoy exploring, but for your and my immediate pleasure I have dug up a little from YouTube.