I have been doing chord analysis on BWV 846 (prelude). It is very interesting and I hope you can help me with some questions:
I understand that doing chord analysis is good but what is the reason for doing it? Will really it help me become good at improvisation and writing songs?
I found a website with a chord analysis of this prelude but I still have questions on the chords. http://www.bachwelltemperedclavier.org/pf-c-major.html the second chord is said to be Dmin/C. Shouldn't it be Dmin7/C?
The sixth chord is said to be D7/C. Why is not written as D/C? The eighth chord is written as Cmaj/B but shouldn't it be written as CM7/B? In this piece there are also some diminished chords. How do you know what chord it is when some diminished chords have the exact notes? We also have a chord written as G7/sus4. I didn't even know sucha chord existed. Anyway, is it really fine to write baroque chord analysis using sus4? The twenty third chord is written as Abdim but that wrong. Is this even a chord at all? Now, what about the three last chords. The last is C but the other two is difficult to figure out. They are not written correctly on the website. Are they even simple chords?
I understand that chords can be written in different ways but what is the right way to write them in chord analysis of baroque pieces?