The other keyboard works by Kuhnau show a varied approach to form. The two parts of his "Clavier-Übung" include 7 suites each. The first is only in the major mode, and the second is only in the minor mode. The suites almost always begin with a prelude, and continue through the usual order of dances – allemande, courante, sarabande, gigue – occasionally with a minuet or aria placed between the dances. Kuhnau's preludes are almost always in two sections: a prelude and a fugue (or a "fugato" section), complete with countersubjects Kuhnau mentions in the preface. Kuhnau's "Sonata in B-flat major", appended to the "Neuer Clavier-Übung, anderer Theil", was for some time considered to be the earliest known keyboard sonata. Later research has shown that it was rather the first keyboard sonata published in Germany and that Kuhnau simply followed the naming convention established by contemporary foreign composers. The composer himself commented on the issue in the preface: