Lithium

There's no bass for the entire first verse.

Bass comes in at the first _chorus_
G----------------------------------------------------------|
D------------7----5-5-5----5-5-5-5-7-7-7-7-----------------|
A-------4----------------7-----------------2-2-2-2-5-5-5-5-|
E--0--0----0----0------------------------------------------|

Then, the second (and third) verse
G-----------------------------------------------------|
D----------------------7--7-7-9-9-9-9-----------------|
A--7--7-6--6-4--4---------------------2-2-2-2-5-5-5-5-|
E-----------------5--5--------------------------------|

The last time you play the above (last one before the chorus)
G------------------------------------------------------|
D--------------------------7-------5-------------------| 
A--7--7-6--6-4--4------5-5---5-3-3---3-2-2-2-2-5-5-5-5-|
E-----------------5--5---------------------------------|

Play the chorus again, then the _other chorus_
G------------------------------------------------------------|
D--------------------------5-7--7-7-5---5--------------------|
A---------3--3-3-----3-5-7------------7---7--7-5-3-0-3-0-3-5-|
E--5--5-5--------5-5-----------------------------------------|

The bridge part, going into the third verse of ending the song
G---------------------------------||---|
D---------------------------------||---|
A--2-2-2-2-2-2-2-2-0-0-0-0-0------||---|
E----------------------------0-3--||-0-|
                                     ^
                                 End of song only
Oh, and one time, the very last repetition of the _other chorus_ part
during the second time its played, there is a variation that goes like
this:

G----------------------------------------------5-------------|
D--------------------------5--7--7-7-5---5-7-7---7-5---------| Then go into
A---------3--3-3-----3-5-7-------------7-------------7-6-5-3-| the above
G--5--5-5--------5-5-----------------------------------------| bridge part.