Gotta Reason Bass Tab

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This is my first tab, this is how i would play it so, yea have fun.

To start there are two drum beats then bass comes in with guitar.

Main Riff:

G:-0---0---3---0-----------5---3--------|
D:-----------------3-/-1-----------3----|  X12
A:--------------------------------------|
E:--------------------------------------|

Build up:

G:-----------------------------------------------------------|
D:-----------------------------------------------------------|  X2
A:-3-3-3-3-3-3-3-3-3-3-3-3-3-3-5-5-5-5-5-5-5-5-5-5-5-5-5-5---|
E:-----------------------------------------------------------|

Main Riff: (Play all through guitar solo aswell!)

G:-0---0---3---0-----------5---3--------|
D:-----------------3---1-----------3----|  X18
A:--------------------------------------|
E:--------------------------------------|

(Break followed by double drum beat. Then play the main riff four times while fading 
You should be finished by the time you finish the 4th riff.)