I think that since at least from the time jazz began to mature, like maybe in the 1940s, there has been a back-and-forth between crowd-pleasing and dance-able music, and more exploratory and artistic music. The Stan Kenton Orchestra traveled with two separate "books," one for dance gigs and another for concerts. Ellington's material, of which there was a lot, is quite imaginative.

To me that's OK. When jazz ceased to be responsible for forming the backbone of popular music, it triggered a more experimental period, including some ventures that were pretty far out, such as free jazz and free improv. Jazz also experienced a shift in focus -- not uncontroversially -- by becoming an object of academic study.

I think we're in a period right now when bands are seeking more audience friendly material. Now, the big-band I play in is in some sense "enthusiast" music. We have a small but loyal audience of people who happen to like this kind of stuff.

But in another of my bands, two of the players are actively composing new material, and it's arguably listen-able by any standards. Maybe we're in a third era, where we're free from responsibility for making popular music, but also free from responsibility for establishing the stature of jazz as a "serious" art form, and can return to the business of pleasing ourselves and our audiences.