I am currently looking at this tune but I'm a bit confused by a part of the progression.
It seems to be using chords built mostly from the C# harmonic minor scale.
So, my current understanding tells me we could use:
Or extending versions of these (eg G#7)
However, at one point, it goes:
C#m, A7, A13, D/F#, Ddim.
Can anyone help me understand what is going on here?
I thought perhaps the A7 or A13 would be followed by a Dmin (secondary dominant) but is doesn't seem to be the case.
Why do the D/F# and Ddim work?
Any advice appreciated.