This is my kind of easy Nirvana knockoff that I had to write for school,
-will

x= muted

Riff 1

e-----------------------------------------
b-----------------------------------------
g-----------------------------------------
d-----------------------------------------
a----555555--9999-0-777777--10101010-0----
e----333333--7777-0-555555--12121212-0----(those are tens and twelves)

Riff 2

e-----------------------------------
b-----------------------------------
g-----------------------------------
d-----------------------------------
a----66-xxxx-99-0-44-xxxx-1111-0----
e----44-xxxx-77-0-22-xxxx-9-9--0----(Those are elevens)

song order

Riff 1 x2
Riff 2 x2
Riff 1 x2
Riff 2 x2

Good luck-will