From the earliest days writers have commented on the juxtaposition between the waltz's simplicity and the vast, complex musical structure Beethoven built upon it, and the widest possible range of opinions of Diabelli's theme have been expressed. At one end of the spectrum is the admiration of Donald Tovey ("healthy, unaffected, and drily energetic", "rich in solid musical facts", cast in "reinforced concrete") and Maynard Solomon ("pellucid, brave, utterly lacking in sentimentality or affectation") and the kindly tolerance of Hans von Bülow ("quite a pretty and tasteful little piece, protected from the dangers of obsolescence by what one might call its melodic neutrality"). At the other end is William Kinderman's contempt ("banal", "trite", "a beer hall waltz").