Lonely valleys are quiet, pleasant, cool, shady, and flowing with fresh waters; in the variety of their groves and in the sweet song of the birds, they afford abundant recreation and delight to the senses, and in their solitude and silence they refresh the soul and give rest. These valleys are what my Beloved is to me.
~ from THE SPIRITUAL CANTICLE by St. John of the Cross
For some birds, songs are learned by listening to their parents and neighbors during
the first year. For other birds, songs are hardwired -- the music is scored in their
brains from the beginning. For mockingbirds, singing is a lifetime of choir practice
and talent shows, picking up new tunes and modifying old ones.