The underlying chords on the album track are Am F G.
Below is pretty much how Therapy? played Diane on the St Patrick's Day video.
The main riff is played by the bass, below is the riff arranged for guitar:
Am F G
e:------------------|------------------|------------------|------------------|
B:------------------|------------------|------------------|------------------|
G:------------------|------------------|------------------|------------------|
D:-7-7-7-7-7-7-7-7--|-3-3-3-3-3-3-3-3--|-5-5-5-5-5-5-5-5--|-5-5-5-5-5-5-5-5--|
A:-7-7-7-5-5-7-7-7--|-3-3-3-2-2-3-3-3--|-5-5-5-3-3-5-5-5--|-5-5-5-3-3-5-5-5--|
E:-5-5-5-5-5-5-5-5--|-1-1-1-1-1-1-1-1--|-3-3-3-3-3-3-3-3--|-3-3-3-3-3-3-3-3--|
Intro (Bass Riff played twice - continues for whole song):
Am F G
G:-9-9-9-7-7-9-9-9--|-5-5-5-3-3-5-5-5--|-7-7-7-5-5-7-7-7--|-7-7-7-5-5-7-7-7--|
D:-7-7-7-7-7-7-7-7--|-3-3-3-3-3-3-3-3--|-5-5-5-5-5-5-5-5--|-5-5-5-5-5-5-5-5--|
A:------------------|------------------|------------------|------------------|
E:------------------|------------------|------------------|------------------|
Guitar Riff (over the above - played four times):
Am F G
e:-0--12-12-12-12/14-|-0----0---0-0-0---|-10-10-10-10-10-10|-10-10-10-10-10-10-|
B;-10-10-10-10-------|-10---8---8-8-8---|-8--8--8--8--8--8-|-8--8--8--8--8--8--|
G:-9--9--9--9--------|-9----9---9-9-9---|-0--0--0--0--0--0-|-0--0--0--0--0--0--|
D:-------------------|------0---0-0-0---|------------------|-------------------|
A:-------------------|------------------|-10-10-10-10-10-10|-10-10-10-10-10-10-|
E:-------------------|------------------|------------------|-------------------|
Verse:
Am F G
e:-5--5--5--5--5--3--|-5--5--5--5--5--3--|-3---3-3---3-3---|-3-3---3-3---3---3-|
B:-5--5--5--5--5--5--|-5--5--5--5--5--5--|-3---3-3---3-3---|-3-3---3-3---3---3-|
G:-------------------|----------------0--|-0---0-0---0-0---|-0-0---0-0---0---0-|
D:-------------------|-------------------|-----------------|-------------------|
A:-------------------|-------------------|-----------------|-------------------|
E:-------------------|-------------------|-----------------|-------------------|
Hey little girl, do you need a ride?
Am F G
e:-5-5-5-------------|-3-3-3-------------|-3---3-3---3-3---|-3-3---3-3---3---3-|
B:-5-5-5-------------|-5-5-5-------------|-3---3-3---3-3---|-3-3---3-3---3---3-|
G:-------------------|-------------------|-0---0-0---0-0---|-0-0---0-0---0---0-|
D:-------------------|-------------------|-----------------|-------------------|
A:-------------------|-------------------|-----------------|-------------------|
E:-------------------|-------------------|-----------------|-------------------|
I've got room in my wagon, why don't you hop inside?
We can cruise down Roberts Street all night long
But I think I'll just rape you and kill you instead
Chorus (Played four times):
Am F G
e:-0--12-12-12-12/14-|-0----0---0-0-0---|-10-10-10-10-10-10|-10-10-10-10-10-10-|
B;-10-10-10-10-------|-10---8---8-8-8---|-8--8--8--8--8--8-|-8--8--8--8--8--8--|
G:-9--9--9--9--------|-9----9---9-9-9---|-0--0--0--0--0--0-|-0--0--0--0--0--0--|
D:-------------------|------0---0-0-0---|------------------|-------------------|
A:-------------------|------------------|-10-10-10-10-10-10|-10-10-10-10-10-10-|
E:-------------------|------------------|------------------|-------------------|
Diane, Diane, Di - ane
Verse 2:
Am F G
e:-5--3--------------|-5-5-5-5-5-5-5-5---|-3---3-3---3-3---|-3-3---3-3---3---3-|
B:-3--3--------------|-3-3-3-3-3-3-3-3---|-3---3-3---3-3---|-3-3---3-3---3---3-|
G:-------------------|-------------------|-0---0-0---0-0---|-0-0---0-0---0---0-|
D:-------------------|-------------------|-----------------|-------------------|
A:-------------------|-------------------|-----------------|-------------------|
E:-------------------|-------------------|-----------------|-------------------|
I hear there's a party down at Le - cove
Am F G
e:-5-5-5-------------|-3-----------------|-3---3-3---3-3---|-3-3---3-3---3---3-|
B:-5-5-5-------------|-5-----------------|-3---3-3---3-3---|-3-3---3-3---3---3-|
G:-------------------|-------------------|-0---0-0---0-0---|-0-0---0-0---0---0-|
D:-------------------|-------------------|-----------------|-------------------|
A:-------------------|-------------------|-----------------|-------------------|
E:-------------------|-------------------|-----------------|-------------------|
It'll be so much easier if I drove
Am F G
e:-5-5-5-------------|-3-3-3-------------|-3-3-3-----------|-3-3---3-3---3---3-|
B:-5-5-5-------------|-5-5-5-------------|-3-3-3-----------|-3-3---3-3---3---3-|
G:-------------------|-------------------|-0-0-0-----------|-0-0---0-0---0---0-|
D:-------------------|-------------------|-----------------|-------------------|
A:-------------------|-------------------|-----------------|-------------------|
E:-------------------|-------------------|-----------------|-------------------|
We could check it out, we could go and see
Am F G
e:-5-5-5-------------|-3-3-3-------------|-3---3-3---3-3---|-3-3---3-3---3---3-|
B:-5-5-5-------------|-5-5-5-------------|-3---3-3---3-3---|-3-3---3-3---3---3-|
G:-------------------|-------------------|-0---0-0---0-0---|-0-0---0-0---0---0-|
D:-------------------|-------------------|-----------------|-------------------|
A:-------------------|-------------------|-----------------|-------------------|
E:-------------------|-------------------|-----------------|-------------------|
Oh won't you come and take a ride with me?
Chorus (Played four times):
Am F G
e:-0--12-12-12-12/14-|-0----0---0-0-0---|-10-10-10-10-10-10|-10-10-10-10-10-10-|
B;-10-10-10-10-------|-10---8---8-8-8---|-8--8--8--8--8--8-|-8--8--8--8--8--8--|
G:-9--9--9--9--------|-9----9---9-9-9---|-0--0--0--0--0--0-|-0--0--0--0--0--0--|
D:-------------------|------0---0-0-0---|------------------|-------------------|
A:-------------------|------------------|-10-10-10-10-10-10|-10-10-10-10-10-10-|
E:-------------------|------------------|------------------|-------------------|
Diane, Diane, Di - ane
Solo:
Am F
e:-12-12-12-12--12-12-12-12-|-12-12-12-12--12-12-0-0---|
B;-10-10-10-10--10-10-10-10-|-10-10-10-10--10-10-8-8---|
G:-9--9--9--9---9--9--9--9--|-9--9--9--9---9--9--9-9---|
D:--------------------------|--------------------------|
A:--------------------------|--------------------------|
E:--------------------------|--------------------------|
G
e:-3-------------------3-3--|-3--3----3--3----3--------|
B:-3-------------------3-3--|-3--3----3--3----3--------|
G:-0-------------------0-0--|-5--4----5--4----5--------|
D:-5-------------------5-5--|--------------------------|
A:-5------------------------|--------------------------|
E:--------------------------|--------------------------|
Am F
e:-12-12-12-12--12-12-12-12-|-12-12-12-12--12-12-0-0---|
B;-10-10-10-10--10-10-10-10-|-10-10-10-10--10-10-8-8---|
G:-9--9--9--9---9--9--9--9--|-9--9--9--9---9--9--9-9---|
D:--------------------------|--------------------------|
A:--------------------------|--------------------------|
E:--------------------------|--------------------------|
G
e:-3-------------------3-3--|-3--3----3--3----3--------|
B:-3-------------------3-3--|-3--3----3--3----3--------|
G:-0-------------------0-0--|-5--4----5--4----5--------|
D:-5-------------------5-5--|--------------------------|
A:-5------------------------|--------------------------|
E:--------------------------|--------------------------|
Am F
e:-12-12-12-12/17-17-17-17-|-12-12-12-12/17-17-17-17-|
B:-10-10-10-10/15-15-15-15-|-10-10-10-10/15-15-15-15-|
G:-9--9--9--9-/14-14-14-14-|-9--9--9--9-/14-14-14-14-|
D:--------------------------|--------------------------|
A:--------------------------|--------------------------|
E:--------------------------|--------------------------|
G
e:-12-12-12-12/17-17-17-17-|-12-12-12-12/17-17-17-17-|
B:-10-10-10-10/15-15-15-15-|-10-10-10-10/15-15-15-15-|
G:-9--9--9--9-/14-14-14-14-|-9--9--9--9-/14-14-14-14-|
D:--------------------------|--------------------------|
A:--------------------------|--------------------------|
E:--------------------------|--------------------------|
Am F
e:-12-12-12-12/17-17-17-17-|-12-12-12-12/17-17-17-17-|
B:-10-10-10-10/15-15-15-15-|-10-10-10-10/15-15-15-15-|
G:-9--9--9--9-/14-14-14-14-|-9--9--9--9-/14-14-14-14-|
D:--------------------------|--------------------------|
A:--------------------------|--------------------------|
E:--------------------------|--------------------------|
G
e:-17-17-17-17--17-17-17-17-|-17-17-17-17--17-17-17-17-|
B:-15-15-15-15--15-15-15-15-|-15-15-15-15--15-15-15-15-|
G:-14-14-14-14--14-14-14-14-|-14-14-14-14--14-14-14-14-|
D:--------------------------|--------------------------|
A:--------------------------|--------------------------|
E:--------------------------|--------------------------|
Verse 3:
Am F G (hold)
e:-0--0--------------|-0-----0----0-0-0--|-3---3-3---------|-------------------|
B:-10-10-------------|-8-9---8----8-8-8--|-3---3-3---------|-------------------|
G:-9--9--------------|---0--------9-9-9--|-0---0-----------|-------------------|
D:-------------------|------------0-0-0--|-5---5-----------|-------------------|
A:-------------------|-------------------|-5---5-----------|-------------------|
E:-------------------|-------------------|-3---3-----------|-------------------|
Lay down in the reeds for a while
Am F G (hold)
e:-5------5-----5----|-5----------5-5-5--|-3-3-------------|-------------------|
B:----5------5-----5-|-3----------3-3-3--|-3-3-------------|-------------------|
G:-------------------|-------------------|-0-0-------------|-------------------|
D:-------------------|-------------------|-5-5-------------|-------------------|
A:-------------------|-------------------|-5-5-------------|-------------------|
E:-------------------|-------------------|-3-3-------------|-------------------|
I'll put all your clothes in a nice, neat, little pile
Am F G (hold)
e:-------------------|-------------------|-3---------------|-------------------|
B:-3-3-3-------------|-3-3---------------|-3---------------|-3---3---3---3-----|
G:-2-2-2-------------|-0-0---------------|-0---------------|-0---0---0---0-----|
D:-2-2-2-------------|-------------------|-0---------------|-------------------|
A:-0-0-0-------------|-3-3---------------|-2---------------|-------------------|
E:-------------------|-1-1---------------|-3---------------|-------------------|
You're the cutest girl I've ever seen in my life
Am F G
e:-------------------|-------------------|-3-3-3-3--3-3-3-3|-3-3-3-3--3-3-3-3--|
B:-------3-----3-3---|-3-3-----3----3-3--|-3-3-3-3--3-3-3-3|-3-3-3-3--3-3-3-3--|
G:-2-----2-----2-2---|-0-0-----0----0-0--|-0-0-0-0--0-0-0-0|-0-0-0-0--0-0-0-0--|
D:---2---2-----2-2---|-------------------|-0-0-0-0--0-0-0-0|-0-0-0-0--0-0-0-0--|
A:-------0-----0-0---|-3-3-----3----3-3--|-----------------|-------------------|
E:-------------------|-1-1-----1----1-1--|-----------------|-------------------|
It's all over now and with my knife
Chorus:
Am F G
e:-0--12-12-12-12/14-|-0----0---0-0-0---|-10-10-10-10-10-10|-10-10-10-10-10-10-|
B;-10-10-10-10-------|-10---8---8-8-8---|-8--8--8--8--8--8-|-8--8--8--8--8--8--|
G:-9--9--9--9--------|-9----9---9-9-9---|-0--0--0--0--0--0-|-0--0--0--0--0--0--|
D:-------------------|------0---0-0-0---|------------------|-------------------|
A:-------------------|------------------|-10-10-10-10-10-10|-10-10-10-10-10-10-|
E:-------------------|------------------|------------------|-------------------|
Diane, Diane, Diane
Am F G
e:-0--12-12-12-12/14-|-0----0---0-0-0---|-10-10-10-10-10-10|-10-10-10-10-10-10-|
B;-10-10-10-10-------|-10---8---8-8-8---|-8--8--8--8--8--8-|-8--8--8--8--8--8--|
G:-9--9--9--9--------|-9----9---9-9-9---|-0--0--0--0--0--0-|-0--0--0--0--0--0--|
D:-------------------|------0---0-0-0---|------------------|-------------------|
A:-------------------|------------------|-10-10-10-10-10-10|-10-10-10-10-10-10-|
E:-------------------|------------------|------------------|-------------------|
Diane, Diane, Diane
Am F
e:-12-12-12-12--12-12-12-12-|-12-12-12-12--12-12-12-12-|
B:-10-10-10-10--10-10-10-10-|-10-10-10-10--10-10-10-10-|
G:-9--9--9--9---9--9--9--9--|-9--9--9--9---9--9--9--9--|
D;--------------------------|--------------------------|
A;--------------------------|--------------------------|
E;--------------------------|--------------------------|
Diane, Diane,
G
e:-12-12-12-12--12-12-12-12-|-12-12-12-12--12-12-12-12-|
B:-10-10-10-10--10-10-10-10-|-10-10-10-10--10-10-10-10-|
G:-9--9--9--9---9--9--9--9--|-9--9--9--9---9--9--9--9--|
D;--------------------------|--------------------------|
A;--------------------------|--------------------------|
E;--------------------------|--------------------------|
Diane,
Am F G(hold - bass slowing)
(hold)
e:-5-----5------5----|-5-----5------5----|-3---------------|----------------3--|
B:---5-----5------5--|---5-----5------5--|-3---------------|----------------3--|
G:-----0-----0-------|-----0-----0-------|-0---------------|----------------0--|
D:-------------------|-------------------|-0---------------|----------------0--|
A:-------------------|-------------------|-2---------------|----------------2--|
E:-------------------|-------------------|-3---------------|----------------3--|
|