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I only have The Painter's Palette (or whatever it's called), which I like. I listened to part of the followup to that and wasn't feeling it. Not sure I'd classify them as avant-garde, unless we're defining avant-garde as anything atypical to a genre's strictest definition.

Love 'em. Probably closer to avant-garde than ED and some of the other bands mentioned in this thread, if only for their occasional free jazz elements.