The song uses basic chords
     D    Em    F#m     E      G    A     B
E|---2----0------2------0------3----0-----2----|
B|---3----0------2------0------3----2-----4----|
G|---2----x------2------1------0----2-----4----|
D|---0----2------4------2------0----2-----4----|
A|--------2------4------2------2----0-----2----|
E|--------0------2------0------3---------------|


[Verse]
D
D
Call out the instigator
                         Em
Because there's something in the air
                        D
We've got to get together sooner or later
                       Em
Because the revolution's here

And you know it's right

Fill A - play this twice. This little piece can be a little bit tricky but it sounds good.
E|-------------------------------------------------|
B|-------3-----------3-----------3-----------3-----|
G|----2-----2-----2-----2-----2-----2-----2-----2--|
D|-0-----------------------------------------------|
A|-------------3-----------2-----------3-----------|
E|-------------------------------------------------|

Fill 1
And you know that it's right


[Chorus]
Em
We have got to get it together
Em
We have got to get it together now
Fill 1 2x


[Verse]
D
Run through the fields and houses
                          Em
Because there's something in the air
                        D
We've got to get together sooner or later
                     Em
Because the revolution's here

And you know it's right
Fill A 2x
And you know that it's right


[Chorus]
Em
We have got to get it together
                                  D
We have got to get it together now


[Interlude/Solo] - it's the same thing again and again just in a different tone
  Figure 1
E|------------------------|
B|--------------------7---|
G|-7--7---------5h7---7---|
D|-7--7----5h7------------|
A|(5)(5)------------------|
E|------------------------|

  Figure 2
E|------------------------|
B|--------------------5---|
G|-5--5---------3h5---5---|
D|-5--5----3h5------------|
A|(3)(3)------------------|
E|------------------------|

  Figure 3
E|-------------------------|
B|--------------------3----|
G|-3--3---------1h3---3----|
D|-3--3----1h3-------------|
A|(1)(1)-------------------|
E|-------------------------|

  Figure 4
E|-------------------------|
B|--------------------2----|
G|-2--2---------0h2---2----|
D|-2--2----0h2-------------|
A|(0)(0)-------------------|
E|-------------------------|

It looks long and confusing but it's really simple.  Here's the layout out the interlude/solo:
Figure 1 2x
Figure 2 2x
Figure 1 2x
Figure 2 2x
Figure 3 2x
Figure 4 2x
Ends with G  A  B
From there the whole rest of the song changes key.


[Verse]
E
E
Call out the instigator
                         F#m
Because there's something in the air

                       E
We've got to get together sooner or later
                        F#m
Because the revolution's here
                       E fill B
And you know it's right

Again it changes key so it changes the fill but it's easy now.

Fill B play twice
E|-----0------------0--------0----------0-----|
B|---0---0-------0----0----0----0----0----0---|
G|--------------------------------------------|
D|-2----------0--------------------0----------|
A|-----------------------4--------------------|
E|--------------------------------------------|
And you know that it's right


[Chorus]
F#m
We have got to get it together
                                 E
We have got to get it together now