Standard tuning. I usually like playing it Drop D because its easier. Just play 2 frets up on the top string.

Verse
|--------------------------------------|
|--------------------------------------|
|----8--8-----------2-3-2-3-2----------|
|-3~------1--1---1---------------------|

|--------------------------------------|
|--------------------------------------|
|----8--8------------------------------|
|-3~------1--1---1/3\------------------|
For this part   ^ ^ ^ slide up from one then slide down slowly

Chorus 2x
|--------------------------------------|
|--------------------------------------|
|--5-5-5--6-6-6--8~--8-----------------|
|------------------------3~--3---------|

Verse
|--------------------------------------|
|--------------------------------------|
|----8--8-----------2-3-2-3-2----------|
|-3~------1--1---1---------------------|

|--------------------------------------|
|--------------------------------------|
|----8--8------------------------------|
|-3~------1--1---1/3\------------------|

Chorus 2x
|--------------------------------------|
|--------------------------------------|
|--5-5-5--6-6-6--8~--8-----------------|
|------------------------3~--3---------|

Rest

During the solo play the chorus until the end of the song

Chorus
|--------------------------------------|
|--------------------------------------|
|--5-5-5--6-6-6--8~--8-----------------|
|------------------------3~--3---------|
Nine inch nails isn't really a bass band but if you want to use a bass then you can.