Was just listening to Hawkwind's 'Song of the Swords' from Chronicle of the Black Sword and I was reminded of a similar passage in the songs.

'Black Blade' goes C-F, D-G on the verses, and 'Song of the Swords' goes F-Bb, G-C on the "Take up the sword . . ." lyric ( repeats on the break, going up to Eb-Ab).

I wonder if Dave Brock 'borrowed' this type of chord progression from Bأ–C (I think he's a fan) or if this is a coincidence.