Well, I don't like the lack of jazz, but I don't think it'd be so bad if they didn't play some of the same songs all day; it would allow for a broader variety.
Ugh. I am a bit disappointed, but that's all I can say. TWC is going to change as time goes, and all I can do is either roll with it or not. A few years ago, I would've hated it, blamed NBC, etc., etc. But now that I'm more mature and have been forced to face unbelievable changes in my life, I am quite used to adapting to new things, and in the scheme of things, witnessing the experimentation of new genres is nothing.
I hope there are some more jazz songs in the future, but if not, there is always iTunes.