G minor fugue, BWV 861
I found this video for the G minor fugue, which is cheating because it is his own analysis of the work. I still found it useful, however, because he sees additional aspects of the fugue that I wouldn't have identified and it;s always useful to see a different opinion of something:
http://www.youtube.com/watch?v=OyvSrpQ2eWY
The video maker highlights passages of imitation well, where there are responses or episodes and stretti later on in the work. The counter subject itself begins with an inversion of the second phrase of the subject.
Within the subjects and episodes themselves there are sequences and imitation, particularly from bars 25-28. I couldn't see any obvious uses of augmentation or diminution though.
Invention No. 14, BWV 785
http://www.youtube.com/watch?v=O4xfapPKEN4
The opening melody is made up of pairs of phrases; the first rises whilst the second is similar to it but inverted. The second bar is than a similar pair of phrases but a fifth lower. Bars 4 and 5 have the opening motif in the left hand, which is then inverted in the right hand in a descending sequence; in bar 5 both hands then play their motifs together. In bars 6-8 the opening themes return but in opposite hands. Bars 9-11 see the themes swapping between hands every bar but the accompanying quavers become more elaborate; a four quaver descending sequence. The theme is shortened and swapped between hands more regularly until both hands play the same rhythmic motif.
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