in the verses, in between chords G - Bm the bass plays an A note, which can be
on guitar 

chords:
    Bm       G        Em
E------------3--------0--------|
B---3--------3--------0--------|
G---4--------0--------0--------|
D---4--------0--------2--------|
A---2--------x--------2--------|
E------------3--------0--------|
[Estribillo]
                   Em 
And either way you turn 
        G 
I'll be there 
                   Em 
Open up your skull 
              G 
I'll be there 
                 Em 
Climbing up the walls
[Estrofa]
G           Bm                  G  Em 
It's always best when the light is off 
G           Bm           G   Em 
It's always better on the outside 
G       Bm                G       Em 
Fifteen blows to the back of your head 
G       Bm                  G     Em 
Fifteen blows to your mind 
G           Bm           G  Em 
So lock the kids up safe tonight 
G       Bm          G  Em 
Put the eyes in the cupboard 
G            Bm          G    Em 
I've got the smell of a local man 
G             Bm          G     Em 
Who's got the loneliest feeling
[Estribillo]
            G      Em 
That either way he turns 
              G 
I'll be there 
                   Em 
Open up your skull 
              G 
I'll be there 
                      Em 
Climbing up the walls 
                      Em 
Climbing up the walls 
                      Em 
Climbing up the walls