During the intro (0:00 ~ 0:04),
The chord progression is: I maj7 -> IV maj7 -> b VII maj7-> b III maj7 -> b VI maj7 -> II7-> b II maj7 -> V
What is this called? Is this an example of an extended "II-V"?
Where can I find more examples like this?
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It's a cycle of fifths (or fourth if you want to look at it this way). It is a chain of chords with roots a fifth apart. The whole thing and parts of it are commonly used. The presence of the flats doesn't matter so much, it's the nominal fifth progression that matters.
These are all variations of the circle of fifth:
(I would also subsum the tritonus substitution and the chromatic scale downwards... )
with a less sophisticated and more generous analysis we could get a better understanding of the harmonic process.
looking for another piece with a similar progression?
here is one at 1:42 min
the bass plays the circle of fifth: B-E-A-D-G-C-F-E
organ, piano and guitar play: B7-Bb7-A7-Ab7-G7-F#-E