That's something you can't get off the wires in New York is people providing intelligent coverage of what your theater company in Podunk is up to. Many of the people who write what we call amateur criticism are professionals in anything other than name and receiving a paycheck. Very often, they know more than the professional critic who might be writing for their local newspaper. So, really, I'm all for it. It's changing the playing field, it's shaking things up, it's going to make the critical environment a healthier environment.

I've always loved opera; it never occurred to me that I would write a proper libretto. One of my closest friends is a composer, Paul Moravec, and a few years ago, Paul and I were at lunch, and I said to him, "you really have to write an opera." So, he says very casually to me, "I'll do it if you write the libretto." Well, little did I know that the within a couple of years we would end up getting a commission from the Santa Fe Opera to write an opera together, "The Letter," which turned out to be the most successful commissioned opera in the history of the Santa Fe Opera.

Virgil Thomson, the great classical music critic, who was also a composer, but said that criticism was the only antidote he knew to pay publicity. Critics at their best are independent voices people take seriously their responsibility to see as many things as they can see, put them in the widest possible perspective, educate their readers, I really do think of myself as a teacher. Newspapers that don't carry arts criticism at all while not fulfill this function. And probably their arts journalism will be deprived as a result.

I'm especially interested in what I call practitioner criticism, which is when people who practice an art form start writing about it on blogs. I think that's an immensely important development. I want to see much, much more of that. People who make music who are verbally articulate. And not all musicians are verbally articulate. But those who are should be encouraged to write about what they do and their perception of what other people do. It makes the discourse smarter.

I was interested in Armstrong to begin with because he is the most important figure in Jazz in the 20th Century. There's simply no question about it. I mean, if you're going to compare him to somebody, it's Shakespeare in terms of centrality of the tradition, in being at the beginning of it.

Blogging has mostly been an opportunity to react more immediately to experiences to try out ideas that I may end up using in the print media or in some other place. When I write books, it's a way for me to bring readers into the experience of writing the book, all through the process of writing the books that I write. I talk about what I'm up to in the blog. I let people know what I am doing. To me, it's just part of putting my professional life up in a way that people who are interested in it can access; and learning things from them as well.

There will be this mix of people like me who write for major national newspapers and amateur critics, practitioner critics, whose primary way of distributing what they talk about is through blogs and on the web. The line between professional and amateur criticism will become increasingly blurred. The problem here is that if you want to do this for a living, you have to be able to earn a living doing it.