Sometimes it's just time to go. If you've given them a fair shot at compromise and it still seems like your (yours and the band's) interests are diverging . . . well, that's OK. I bailed a couple of years ago on a music club with whom I had been very involved for over ten years. They were becoming more and more of a "teacher" type organization with much less advanced-level jamming, and very dependent on a small but powerful faction of members. It wasn't what I wanted and I was bored, and resented that so few people continued to support the things that were the reason I had joined in the first place. A handful (literally. We're talking three people) split off and started a tiny jam of our own. It's hardly ideal but it's better and it saved us getting more and more frustrated and angry with the original club.

Obviously, I don't know what the issues are and it's not my place to ask, but I hope you can either resolve them or take your leave with a minimum of hard feelings.