I think it's like music for the sake of music, and a lot of the words stem from liking music a lot, wanting to be a good band and having a good sense of humour, and living in a situation where we're free to pretty much do what we want.
In a way, the history of jazz's development is a small mirror of classical music's development through the centuries. Now jazz is a living form of original music, while classical music has gotten to the end of its cycle in terms of exploring its form.
There's a sadness to the human condition that I think music is good for. It gives a counterpoint to the visual beauty, and adds depth to pictures that they wouldn't have if the music wasn't there.
The power of sound to put an audience in a certain psychological state is vastly undervalued. And the more you know about music and harmony, the more you can do with that.
