Transpose -5 steps with buttons on the left for original key, (or leave like this 
to sing with baritones!). (note the original is off standard pitch a little).  Ask 
if you want chord fingering help.

Intro: riff (C-F) x3  riff  (see tab notes below)

           C-F     C-F                C   -     F       C-F
She's been good to me, she's been as kind as a girl can be
               G                                Am              riff
But I get the feeling, she thinks that certain something is gone
          C-F     C-F             C     -      F         C-F
It's the little things, like the words to the songs she sings
              G                             Am       
Are a little different, and I can tell that I'm not the one
             Dm  -     Em       F   -  G       C-F  C-F
It's just a matter of time, forgotten but not gone
          Dm  -   Em       F   -  G       C-F  C  riff
I'm the invisible guy, forgotten but not gone

       C-F    C-F            C    -     F          C-F
It was my mistake, 'cause I gave less than I could take
             G                          Am            riff
And I never noticed she wanted something I didn't have
        C-F    C-F            C   -   F      C-F
And my roving eye, drove her off to another guy
                 G                           Am       
Now she doesn't see that to keep from crying I've got to laugh
             Dm  -     Em       F   -  G       C-F  C-F
It's just a matter of time, forgotten but not gone
          Dm  -   Em       F   -  G       C-F C
I'm the invisible guy, forgotten but not gone

 NC                        riff2  G
And it's so hard to believe
        Em       Dm7               F             G         C-F-C
When I call her, she turns away, like she don't see me at all

 NC                        riff2  G
And it's so hard to believe
          Em   Dm7                F               G          C-F C-F C-F riff
All that water under the bridge, don't count for nothing at all

         C-F       C-F          C      -         F      C-F
It's the same old line, out of sight and you're out of mind
              G                               Am            riff
But I never thought that I'd see the day when she didn't care
         C-F      C-F         C     -    F     C-F
But the joke's on me, I came home yesterday to see
               G                         Am       
Them in bed together and making love like I wasn't there
          Dm  -     Em       F   -  G       C-F  C-F
It was a matter of time, forgotten but not gone
              Dm     -     Em       F   -  G       C-F C-F
I could have rolled up an died, forgotten but not gone
           Dm  -  Em       F   -  G       C-F C riff  x3 C-F C
I'm the invisible guy, forgotten but not gone

Key of C above:
riff               riff2
e----------------|---------------------------|
b-3-b-br-1-------|---------------------------|
g----------2-0---|-----------------------0---|
d----------------|---0-2-3-2-0---0-----------|
a--------------3-|-3-----------3---3-2-0-----|
E----------------|---------------------------|

Original key:
riff               riff2
e----------------|---------------------------|
b----------------|---------------------------|
g-2-b-br-0-------|---------------------------|
d----------2-0---|-----------------------0---|
a----------------|---0-2-3-2-0---0-----------|
E--------------3-|-3-----------3---3-2-0-----|