Bird's view on bird song

I happen to live in an apartment house's inner yard side which has trees there by the house and singing birds in the trees. And so I have learned something more of what birds are like and how to communicate with birds. Some time ago, this spring, I was on the nearby bus stop and birds sang there too. I was wondering how a bird thinks of it's song, when a singing bird near by seemed to say that a bird does not sing, the tune of it's song is the general atmosphere of birds' life, of that species it is. Like melancholic well running daily life produces a melodical downward melody. Today I was pondering of the subject and thought that an upward ending of another species with similar song is quite the same but with ahopeful attitude and enjoyment of the greenery, of town miljö or the like. And the titityy of tit could be trying to live on that wisdom/idea and then at another good guess, so it produces just two notes at different pitches but quite expressive of living the spring.
Another impression is that birds and other animals in addition talk like humans, sometimes even the same language but in very funny, clumsy young expressive, peculiar individualistic and/or quick way with a different type of pronouciation, wording and view of what to say at the same time, like one person talking on top of the other and younger generation picking them all to one's expression.