Laura just recorded the 'straight up' version, a capella.  Here it is.
The key is G and the guitar chords (for those interested) would be (original lyrics)
VERSE 1
  G       
I come to the gar-den a-lone,
          C                   G
While the dew is still on the ros-es,
D7                             G              A7                  D7
Nature's voice I hear, Fall-ing on my ear, The universe dis-clos-es.
CHORUS
             G                                     D
And she walks with me, and she talks with me,
           D7                G
And she tells me I am her own,
        G      B7           Em                    C                   G          D7       G
And the joy we share as we tar-ry there, None oth-er has ev-er known.
VERSE 2
   G           
Nature speaks, and the sound of her voice
      C                           G
Is so sweet, the birds start their sing-ing,
        D7               G                A7             D7
And the mel-o-dy That life gives to me, With-in my heart is ring-ing,
CHORUS
VERSE 3
    G            
Knowledge stirs and its movements so true
                 C                   G
The sun dawns to highlight its glory
D7                                    G                                         A7                     D7
And the light it brings, dancing with those beams will grace my whole life's story.
CHORUS