Progression ending on vii°7/vi - I

[rbarata]

I'm wondering how common is this.
IMy interpretation on why this sounds good is because the sec. dim is built on the relative minor of the tonic of the progression, which is closely related with it's relative minor.
Am I thinking correctly?

[shawshawraw]

Hi! You may simply think it as a V sound. Here's a couple of my perspectives:

- #5 = b6 in scale = b9 on V7 (V7b9 minus root)

- The four dim7 chords share the same notes, and can act as passing/neighbour chord in the extended scale of major + #5/b6.

- iv (IVm) / iiø (IIm7b5) have a V-ish sound too

Probably not a very common progression though! Here's one in the wild - check out the very end:

https://youtu.be/h_p8ZwGA5nI

[Farnaby]

I don't understand the symbolic notation here. Can you give an example of the actual notes that might form this progression. It might be easier to comment then.

[rbarata]

See Bach's Prelude in C Maj from the WTC, measures 12-15.

[Farnaby]

It's essentially a V7 - I progression. The 9th is flattened though. Not particularly uncommon - as you point out, Bach uses it twice in quick succession there.

[rbarata]

Thank you for all the replies...learned something new.