Dan Fogelberg does this with open G tuning of some kind, but I can't figure that out, but here are some 
chords that fit well, and can be capo'ed to fit most vocal ranges.


Intro: One verse instrumental 
  
C      Dm                   Em            F
Longer than there have been fishes in the ocean
C      Dm       Em        F
Higher than any bird ever flew
C      Dm                 Em              F
Longer than there've been stars up in the heavens
D#           Dm        C   F G(bar'ed)
I've been in love with you

C        Dm       Em           F
Stronger than any mountain cathedral
C     Dm       Em        F
Truer than any tree ever grew
C      Dm       Em         F
Deeper than any forest primeval
D#      Dm        C
I am in love with you

Bb    F    G#          D#
I'll bring fire in the winter
Bb      F    G#             D#
You'll send showers in the spring
Bb     F   G#                    D#
We'll fly through the falls and summers
      G           G7
With love on our wings

C           Dm           Em              F
Through the years as the fire starts to mellow
C        Dm           Em          F
Burning lines in the book of our lives
           C        Dm             Em              F       
Though the binding cracks, and the pages start to yellow


D#         Dm        C
I'll be in love with you
D#         Dm        C
I'll be in love with you

D#  Dm  C  F - G

C      Dm                   Em            F
Longer than there have been fishes in the ocean
C      Dm       Em        F
Higher than any bird ever flew
C      Dm                 Em              F
Longer than there've been stars up in the heavens
D#           Dm        C   
I've been in love with you

D#      Dm          C
I am in love with you

D#  Dm   C
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