Procol Harum - A Salty Dog chords

A SALTY DOG (simplified, in G)
by Procol Harum

A worthy exercise in how majors, minors, sustained and sevenths of 
the same chords, as well as notes next to each other (E, F, F# G) 
can not only work together but be very melodic. Sort of orchestral?
Zackly.
[ Tab from: http://www.guitaretab.com/p/procol-harum/218887.html ]
 G                   F#sus      F#     F#m7                Esus E
 'All hands on deck, we've run afloe!' I heard the captain cry
   D6        D   F#m    Bm        Bm7  F#m     Gm            Bb
'Explore the ship,    replace the cook:    let no one leave alive!'
F                   C               F      Fmaj7           F7
Across the straits, around the Horn:   how far can sailors fly?
Bb                  Bbm                  F            Csus-C
A twisted path, our tortured course, and no one left alive

We sailed for parts unknown to man, where ships come home to die
No lofty peak, nor fortress bold, could match our captain's eye
Upon the seventh seasick day we made our port of call
A sand so white, and sea so blue, no mortal place at all

We fired the gun, and burned the mast, and rowed from ship to shore
The captain cried, we sailors wept: our tears were tears of joy
Now many moons, how many Junes, have passed since we made land
A salty dog, this seaman's log: your witness my own hand

[Most lyrics show the 7th word "afloat". Just as when you run into 
the ground, and then you've run aground, should you happen to run 
into an ice floe -- a big chunk of ice like an iceberg, but mostly 
flat -- then you've run afloe.]