Common wisdom would have you believe that most bands approaching their third decade, and / or seventh album, will have found either a comfortable groove, or a furrow that they like to plough, and that the desire to challenge themselves and their supporters, to expand or revitalise their sound, has probably been dissipated to some degree. The cycle begats the (album) cycle and the artist, conscious of the desired output, sates the audience even if they do make token refinements to keep their own creative beasts content. For while there may be tweaks and tinkerings, there are, deep-down, a forest path of a woodland much explored, not often adventures anew.
