Riff 1
1.    1a
|---|------------------------------------------------------------------------|
|---|------------------------------------------------------------------------|
|---|--------------------------2------------------------0-----2--------------|
|---|---4-------4-----4-----2-----2h4---4-------4-----4---42---2h4-----------|
|-2-|-2---2---2-----2-----2---2-------2---2---2-----2------------------------|
|---|-------0-----3-----3-------------------0-----3--------------------------|


Riff 2
                    *
|-----------------|--------|
|-----------------|--------|
|-4---------------|-----9--|
|-4--------5------|-----9--|
|-2--------5------|-----7--|
|----------3------|-0-0-7--|


Riff 3

|--------------------------|
|---2-------2--------------|
|-----2---2----------------|
|-4-----4---------4-2-0----|
|---------------2-------4--|
|-------------3------------|


Riff 1a is almost played through the whole song except the end when you
have to play riff 3 about which I am not sure if it is right!
When there is this kind of refrain (riff 2) you have to play that
riff with the ending * three times and the fourth time you stop with
the G chord!
At the beginning of this song you have to play "1." only at the beginning
- then continue with the "riff 1a".