I know there are a couple versions of this song on here already
but I had some trouble with them so I figured I would take a shot at it.
I decided to tab Sarah McLachlan's version cuz it was a bit easier
than the others. In her version, the chords are strummed out in three
notes.
For example, D# would be:

|-------|
|-------|
|-----8-|
|---8---|
|-6-----|
|-------|


D#            C
Why are there so many
G#           A#
Songs about rainbows
D#                C      G#
And what's on the other side
D#           C
Rainbows are visions
G#         A#
But only illusions
D#                C          G#
And rainbows have nothing to hide

G#             G#              G#           G#
So we've been told and some choose to believe it
Gm                          Gm
I know they're wrong, wait and see!
G#            A#
Someday we'll find it
G               C
The rainbow connection
G#              A#            D#
The lovers, the dreamers, and me!