clean for today's parameters ... I do not know how to put him and for me( to reproach ZZ Top to be too "clean" ?) It would be absurd to scold and not to draw both visions. Wide further reproaching a progressive group of being "too" virtuous is foolish as to reproach a hard and heavy band of not being enough. More than silly, true but very restrictive, almost dull: the aesthetic and expressive evaluation should consider these aspects, but know how to transcend in part