First Tab!! It's not perfect,  but it's basically the gist, there are some fills that I 
couldn't figure out because i'm not a great bassist, and the rhythm should be self 
explanatory by listening to the song.

Order of song goes like this:
Intro, Verse, PreChorus, Chorus, Intro, Verse, PreChorus, Chorus, Bridge, Chorus

Drop C# Tuning (Drop Db)
F#--------|
c#--------|
G#--------|
C#--------|

Intro:
-----------------------|
-----------------------|
-----------------------|
--0--2--5---0--2--5----| x2

Verse: (Verse 2 has missing fills)
-----------------------|
-----------------------|
--2--0-----------------|
--------0--2--5--------| x2

PreChorus: ("My friends and I..")
---------------------------------------------------------------------|
---------------------------------------------------------------------|
--2--0-------------2--0-------------2--0-------------2--0-----0------|
--------5--0--2----------5--0--2----------5--0--2----------5---------|

Chorus: ("One day..")
---------------------------------------------------------------------|
---------------------------------------------------------------------|
-----------0-------------------------0---5--0-----0------------------|
--0--2--5------5--4--2--5---0--2--5------------5---------------------|

Bridge: ("So chin up..")
-----------------------|
-----------------------|
--2--0-----------------|
--------0--2-----------| x4

---------------------------------------------------------------------|
---------------------------------------------------------------------|
---------------------------------------------------------------------|
--0--2--5--2---0---0--2--5--2---0--2--5--2---0---0--2--5-------------|


Any Questions or Tips/Whatever Send email or pm