.... I understand. Abacab is simply too strong to hear it in one go
Well no, that really isn't my problem with Abacab and I happen to disagree with you assessment of that album being the most adventurous, to me that would be the Lamb which I find much bolder, musically, lyrically and in terms of steering the band away from known territories and as Phil said, is simply too much music sometimes, to absorb in one go. Abacab's material is imo simply too weak, there are 3 to 4 songs top which have some sort of relevance in the Genesis' songbook. I really cannot be bothered with stuff like the title track, NRAA, Whodunnit, LION and Another record. Don't get me wrong: I applaud the change of direction and if they had merged the best songs on Abacab and Shapes it would have been an incredibly strong album but as it is, I feel that Abacab is important because it laid down the new course and the incredible energy it exudes, not because of the songs per se. To me at least.