Quote:
Originally Posted by Jon Delaney
1 and 2 in books 1 and 2. I was taught that and read that it was the norm, but again, I'm usually more likely to be wrong than right 
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Ok, in the first WTK book, fugue 1 ends in the dominant, second 8th note in second measure. How do I know that's the ending to the subject? Well, look at how he follows through with the 16th movement after the G, and later through all the fugue. The 16th passage is what I call a "tail", it's not really part of the subject, but it's there attached to it through all the expositions of the subject.
This is also supported by the G having a longer duration, and it's probable that in Bach's time that note would've been accentuated by using an ornament during performance to indicate it's importance in harmonic context.
Either way, it's not a good example since there are always all sorts of exceptions. Same for the second fugue of the WTK, though in this case the subject seems like it ends in the 3rd, look carefully at what follows the subject when it's in C minor. In the first exposition, in the third measure, it jumps a 6th from E flat to C before the answer comes in G.
Though the beat falls on E, the C that comes after should be considered the final note. Another example, in the exposition in measure 11 in E flat major, the subject also jumps in measure 13 to E flat right after "ending" in the 3rd. Sometimes, it's hard to see but these things do have an effect on what you hear as far as central tones are concerned, even if they fall in off-beat or are less accentuated.
The thing is, in the C minor example, having the 3rd at the end in a strong beat means that the cadences at the end of the subject flow better, since the 3rd is in the subject/answer (in downwards motion) and not in any of the other voices. But this only works if the three voices are there already, otherwise, notice how the tonic always comes after the ending 3rd. There are all sorts of tricks related to these things, but think of it as establishing anchors in a tonality before you set off to do stuff in it.
So, I hope that clears things up a little.