Crisis Rail

The verses have a unique, jazz-influenced chord progression:
Dsus2, D6add9 (or Esus2/D), D minor major 7, and G/D. The tonic of D, 
alternating with the dominant, A, is sustained on bass guitar as a pedal point throughout the verses. 
The D6 with an added 9th is not unlike an Esus2 with a D in the bass, but because the bass line also provides the
fifth, it is more accurately described as a kind of D chord. The D minor chord with a major seventh is a rarity in
1970s rock music. There is also a secondary sequence, louder, with thick vocal harmonies, with a progression 
of B minor, A major, G major seventh suspended second, commonly written as "Gmaj7sus2" (enharmonic to the slash chord D/G), 
and C major. This progression is played twice between each verse, and is not unlike a chorus, except that
the lyrics are different with each repeat.