When you write about music a lot, as I do, you find yourself wondering about the nature of the stuff. Why do so many people make music? Why does almost everybody love to listen to it? Where in our bodies and minds does it come from?
Because I write songs, I have a partial answer to that last question. One source of music is the natural rhythms of the body. I know that because I often get musical ideas while I'm hiking.
The steady rhythm of hiking - walking, walking, walking, all day long - will induce a familiar song to pop into my head. Pretty quickly I'll get sick of that song running through my mind, and the best way I know to get rid of it is to force it to change. So I make a couple of modifications to the beat or the melody. At the same time I think of some nonsense words to go with the new music that's forming in my brain. Voilà - an idea for a potential new song.
It occurred to me that maybe, at least in humans, music actually springs from the rhythms of walking. If we didn't walk, maybe we wouldn't have music at all (or maybe we'd have just the non-rhythmic kinds - Arvo Pärt, Ornette Coleman, ambient music). There'd be no baroque dances, classical music, gypsy music, bebop, rock and roll, or techno. (One theory of the origin of the term "rock and roll" suggests that it came from the hammer songs of track workers, who had to rock and roll their railroad spikes to set them for the hammer.)
Rhythmic bodily functions like breathing and heartbeat might have contributed to inspiring the invention of music too. My point is that that all animals move - that's pretty much the definition of animal, in fact. We walk on the ground, or climb through trees, or propel our bodies through the medium of air or water. Pretty much every animal makes motile progress by means of some repetitive rhythmic action (walk, swim, fly, slither). And if we humans were inspired by our own motion to develop music - if music has its genesis in such a basic function, one that we share with even the simplest, one-celled animals - it shouldn't be much of a stretch to interpret the songs of birds or whales as having the same origin, and being the same thing, as human music.
Many animals, of course, use "tone language" to communicate. Temple Grandin, in her extraordinary book Animals in Translation, argues that these musical sounds are music, just like human music, and suggests that music is, or can be, a language.