In Bach's Toccatas for keyboard works (BWV 911-916), I would like to know if there is a name for the style of music that is sometimes put in the middle of the toccata.
For example: in the G minor toccata, BWV 915, we have a toccata-style opening. After that is a second section starting bar 18 in B-flat major, which has fugue-like elements: it sounds like it has a subject and small episodes. But it doesn't really sound exactly like a fugue either. The toccata style returns on bar 68. The fugue proper starts on bar 79.
So, for this second section: is there a name for this kind of style (second section as indicated, Bars 18 to 67)? It does not really sound like the many dance styles that occur in the English suites or the French suits.
In fact, the closest style of Bach that I found that I feel sounds similar to this is the duet in F major BWV803.
This type of section does not seem to appear in all toccatas, like BWV911 in C Minor.