I'm trying to analyze a song I recently discovered, "The Chamber of 32 Doors" by Genesis. Here is the song link:
At 1:02, there is a chord progression with a descending chromatic bass line. The chords of this section are: C#m G#/B# Bm F#/A# F#m/A F#°/A G# C#sus4 C#
I would analyze the chords the following way: c#: i V6 iv/iv IV6 iv6 ??? V I(5/4-5/3).
I'm not quite sure how to analyze the F#°/A chord. Is there a way to explain how this chord is functioning and where it "comes from"?
I'd appreciate any thoughts on how this could be analyzed from a theoretical perspective. Thanks in advance!