Rayna tunes her Bass down to a low-B just like Meegs. Tuning goes 
(from low to high) B,E,A,D so if I were you I would would buy
a low-B string and re-tune your bass. OK here it comes. 
 
Except she tunes like this on this song A,E,A,D
 
Very Beginning Rayna is just going 
D|------|
A|------|
E|------|
A|--0---|
play 4x and let it ring
 
Main Riff (Most of Intro, Verse, Chorus)
D|---------------------------|---------------------------|
A|---------------------------|---------------------------|
E|---------------------------|---------------------------|
A|--3-3--3-4--3-3--3-4--3-4--|--3-3--3-4--3-3--3-4--3-4--|
 
 
Pre-Bridge Riff
D|-----------------|-----------------|
A|-----------------|-----------------|
E|-----------------|-----------------|
A|--0--h3---0--h3--|--0--h3---0--h3--|
 
 
 
Bridge
D|--------|
A|--------|
E|--------|
A|--0-----|
let ring then go back to Main riff
 
 
Interlude pt.1 ("No fear, So depraved")
 
D|----------------|
A|----------------|
E|----------------|
A|--0---3--2---3--|
 
 
 
Interlude pt.2
 
 
|-----------------------------------|
|-----------------------------------|
|-----------------------------------|
|--6--5--0--2-3-0---6--5--0--2-3-0--|