I'm trying to figure out what's going on in David Bowie's song, Battle for Britain. (The intro ends at 0:35 or so.) These are the chords, near as I can tell. One chord per measure.
En B F# A A B F# A A B F# A A B F# A A G F# E E G F# E E G F# A (skipped measure) C G Bbmaj7 F En...
The first 4 lines follow the common I-V-bVII sequence (or V-I-IV if you prefer).
The next 2 raise the tension by switching things up somehow. I think maybe it's good to say the key changes? Changes to E and there's some kind of chromatic planing, or is the F# after G a substitution for something, or...?
In the next line it goes to A instead of E, and somehow it sounds like a new key all of a sudden! It sounds like the A suddenly acts like secondary dominant V/V in G. Then on the next line you can say IV in G follows, as commonly occurs after a V/V in pop music.
On this next line you then have IV-I-bIII-bVII, similar to the common I-V-bVII-IV except the tonal center is on the second chord.
So what's going on in lines 5-7? Specifically, what's happening to the tonal center? Can the rest of my analysis be improved?