Birds are some of the best musicians. Have been since forever.
We enjoy music because we find patterns of elegance. Bird song is communication, and naturally there are many and varied patterns within their songs. Aside from humans and possibly sea mammals (whales and dolphins), birds probably have the most complex languages. They have to communicate over distances, unlike many other animals (and humans) who rely on facial/body language as well. You need sophisticated language to have what is essentially an aerial communication network.
I love going out on a beautiful morning and hearing the birds. There are so many (and so many kinds) where I live.